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1、小数混合运算专项练习 276题（有答案）(1)0.11 X 1.8+8.2 X 0.11(8 )1.56 X 1.7+0.44 X 1.7(2)2.34 X 99+2.34(9 )1.8 X (3.41 -2.9 ) + 0.03(3) 5.4+2.7 X 0.8(4) 132X 101(5)6.25 + 1.25 +0.8(12 )8.48+0.8X0.9(10 )0.125 X 32X 2.5 .(11)1.258 X 18.5 0.258 X 18.5(6)2.5X16.(13 )1.25 X2.46.33X101 6.33(14)5.85 + ( 1.3+0.5 ) X 6.(15 )
2、17.17 6.8 3.2 6.17(23 )5.4 + 2.5 X ( 3.7 2.9 )(16 )5.4 X (1.3+2.15 ) + 0.2(24 )0.8 X ( 4 3.68 ) + 0.01(17 )8.4+0.6+8.4 +0.4(25 )83.7 12.83 0.17(18 )16.8 X 10.1(26 )5.96+13 X ( 3.2 - 3.12 )(19 )10.9 0.9 +0.2+1.8(27 )4.32 +2.4 X 1.7 ;(20 )1.25 X 3.2 X 0.25 .(28)16.2 X4.5+3.8 X 4.5 ;(21)1.36+4.85+2.64+
3、6.15(29)9.05 -3.86 3.14 ;(22 )98.5 +2.5+4(30)7.28+0.72 +0.9(31)4.32+5.43+6.68(39 )2.9+7.1 X 10(32 )17.17-6.8- 3.2(40 )1.25 X 32 X 0.25.(33 )5.29X 9+5.29(41)15.68- ( 7.78 4.32) - 2.32(34 )16.8X 10.1(42 )0.25 X 3.2 X 1.25(43 )9.99X1.01(35 )2.74X 9.5+5 X 0.274(36 )0.36+9.6 + 3.2.(44 )4.63X1.4+46.3X0.86
4、(37 )3.75X25+6.25X 25(45 )17.5 + 0.8+ 12.5(38 )25.46- 8.23- 1.76(46 )0.9+9.9+99.9+999.9 .(47 )2.9X 99+2.9(55 )(36.7 4.9) X 101 31.8.(48 )25X 11.2X4(56 )6.33X101 6.33(57 )35.6-5X 1.73(49 )23.25- 6.75- 3.25.(50 )125X 3.2X2.5(58 )1.6X 55.4- 55.4X 0.6(51)3.6X 10.1(59) 17.68+5.2+2.7 X 1.5.(52 )5.8X 2.7+0
5、.58 X 73(60) 1.08 X0.8 +0.27(61)102X0.45(53 )3.6+6.4X 1.8(62)22.78 + 1.25 +0.8(54)(1.48+3.02) + ( 3.6X 0.5)(63 )0.34 X 101 - 0.34 .(71)5.4+ 0.51 + (1.2 1.03 )(64 )0.125X 32X2.5(72 ) (8.15.6) X 0.91.05+ 0.04.(65 )0.8X 6.3- 0.8X 3.8(73) 10.8-0.8- ( 0.35+0.05)(66)504+3.2X2.08(74) 8X 1 + ( 2.3-2.25)(75)
6、2.64X9.9+0.264(67) (20- 0.8X 9) X 5.7(68) 2.4X 1.5+3.6+ 1.5(76)4.52+0.61+1.39+6.48(69) 7.38- 5.14+3.62 2.86(77) 4.27 ( 1.96 1.73 )(70)0.12X 1.8+8.2X 0.12(78) (294.4 19.2 X 6) + ( 6+8)(79 )12.5 X 0.76 X 0.4 X 8X 2.5 .(87 )12.54- 4.56- 3.44 1.54(80 )4.98+8.02X2.5(88 )(9.36X 5+9.36+9.36 X 2) X 1.25(81)
7、60.8 40.8+2.5(89 )7.236-0.18- 14.3X0.02.(82)0.8X 69.6 X 12.5(90)9.6+0.4X0.25(83)4.98X99+4.9(91)29.7 + (5.85+0.65)(84)6.48+3.2 + 2.5(92)7.4X 9.9(85) 1.2X 7.6+7.6X6.8.(93)3.84-2.7X 0.64(86) (9.4 5.8) X 2.07(94)8.68 8.68+0.56X 0.5(103 )6.3+3.7X2.8.(104) 2.15+8.73+1.27+7.85(97 )9.12+9.12 X 9 - 60.2 ;(10
8、5)11.87- ( 8.2+1.87)(98)28.4 +0.4 +0.25 ;(106)5.42 3.87 1.13(99)27.36 27.36 +7.6 .(107) 4.38- 1.56+0.62 0.44(100) 3.25X 0.45+6.75 X 0.45(108) 0.4X 270X 2.(101) 31.524.5+3.5(109) (40+1.25) X 8(102) 7.5X 102(110) (12.5 0.05) X 8(95 )4.7X 4.7+4.7+4.3X4.7.(96 )2.72 + (8.2 6.5) X 0.5;(111) 2.6X 8.5+8.5X
9、7.4(119 )5.5X 17.3+6.7 X 5.5.(120) 99X4.2+4.2(112 ) 9.9X 6.9- 6.9X 3.9(113 ) 5.6X 99+5.6(114 )2.5X ( 1.9+1.9+1.9+1.9)(122 ) 6.4 X 14+15 X 6.4+6.4(121) 0.25X1.25X 3.2(115 )7.2+1.25 + 8.(116 ) 52.4- (15+0.6) + 1.6(124) 4X ( 25+2.5+0.25) + 111(123)(1.3+1.3X 0.125X 8) + ( 80 77.4)(117) 9.87X 99+9.87(125
10、)6.25+(17.2 3.6X4.5) +0.32(126) 28.4X99+28.4(118) 46.8+0.9 + 0.4(127)0.94X2.5-0.45(135)(5.36+7.64) + 13X 100(128 )4X0.8X 12.5X 2.5(136) 7.575+ (5.63- 1.88) X 0.2.(129 )17.5-0.25X 17+13.(137) 7.5 (5.5+1.24)(130 )10.1X871380.26+15.68+9.74+2.32(131) 2.3+3.19+ (22 19.8)(139)13.26+9.55 - 3.26(132)1.25X 7
11、.2.(140 )6.1+3.9- 6.1+3.9.(133 ) 9.1 1.2+66.24(141) 31.7 +0.63 (保留 2 位小数)(138) 7.3+12.8 - 3.8X 2.3(142) 2.4 X 1.5+3.6 +1.5(143) 0.32 X 0.25+0.08 +4(151)67- (2.98+0.67 )(144)(9.6+1.48 +3.7 ) +8(152)8X 16 73.8 X6(145) 5.8 + 4 X (1.34 0.14)(153)(45+14) + 73+710.(146) 5.4 + 0.51 + ( 1.2 1.03 ).(154)13.7
12、 X 0.125 X 8(147)21.35 3.25 16.75(155)0.8 X 13 - ( 3.12+5.28 )(156)102X 0.56(149)32X 2.5 X 0.125(157)1.53 X 1.7+0.47 X 1.7 .(148)33.02 - ( 148.4 - 90.85 ) + 2.5158)5.18+0.73+0.82(150)18.1+ (3 0.299 +0.23 ) X 1.(159)0.75 X 1.8 + 1.5(167)78.7 17.7 X 3.6(160)12.5 X 7.1 X 0.8(168)18+ 0.3 X (8 6.5 )(169)
13、12.7+12.5+0.5(161) 6.12 X 99+6.12(162) 8.6 +0.86+8 X 0.35(170)91 + 2.6 +0.05=(171)6.3 X 3.7+6.3 X6.3=(163) 5.6 X ( 18.5 8.5 +0.5 )(164)0.125 X4.78 X 80(172)(3.7+1.7 X 0.4 ) + 2.5=(165)2.8 X 3.6+1.4 X 2.8(173) 7.28+3.2 +2.5=(166)(0.4+40 ) X 2.5(174) 0.74+0.9 X 7.4=(175)7.8 +0.125 +0.8=(183)22.74+8.68
14、 13.74.(184)10+0.2+2.5(176) 37.5 + 0.3 X ( 1.34 0.84 )(185)64X4.5+3.6X45(177) (2.5+27.75 + 1.5 ) X 1.6 .(178)6.21 3.8+2.2(186) 1.25 X 3.2 X 0.8(187)14.5X102(179) 6.03+3.7+2.97(180) 17.43- 6.57- 2.43(188)14.64+3.7 X 2.8(181) 20.47 - ( 1.47+6.8)(189) 8.4+0.21 + 0.5.(182)13.26+4.71+3.47+5.29(190) 0.125
15、X 9X 8X 0.3(191)4.62+5+0.66(199)32.4 X 6.3+32.4 X 3.7(192) 5.78X 2.3+5.78+5.78 X 6.7(200) 18.2 - 10.6 X ( 0.9 0.75 )(193)7.75 X 20- ( 3.24 3.04).(201)0.25 X3.85 X 40(194)1.25X 0.5X8X 0.2(202)1.46 X3.5+3.5 X 4.54 .195)0.97 9+0.97203)7 12.5 0.8(196)5.4+ 3X ( 3.8 2.9).(204)4.7 X 3.6+4.7X 6.4(201) 0.4 X
16、 ( 3.2 0.8 ) + 0.15(205) 1.45 X (2.8+4.4) +2.4.(198)5.7+1.9 X 0.2+7.6(206) 4.2 X ( 6.18 3.03 ) +6.3(207)15.02 - 6.8 - ( 1.02+1.2 )(215)0.25 X0.8 X 0.125 X 0.4(216)2.7 X 1.5 - 2.7(208) 0.6 X (5 0.68 ) +1.2(209) 2.7 +4+6.3 X 0.25(217)9.08+5.45+11.92+4.55(210) (6.02+2.8 ) - 0.4 - 2.05(218) 1.25 X30X 1.
17、2 X 0.8 .(211)3.08 X 3.5+6.2 X 3.08+3.08 X 0.3 .(219)0.6+0.94 - 0.208(212)2.3+3.91 - (22- 19.7)(220)4.85X1.25X8(213)21.6+ 64.8 (48.6 2.7X 2).(221)(64 22.4+ 1.4) X 1.2(219) 93.6 X 3.6+1.4 X 3.6(222)18.3-6.25- 3.75(223)2.8X 3.6+1.4X2.8(231)7.05 X 23.7+7.05 X 76.3 .(224)6.6+ 14.5 ( 1.7+1.8)(232) (7.65.
18、2) +0.4+2.54 X 32.(225)0.25 X 9.87 X4(233) 17.68+5.2+2.7 X 1.5(226)36.7 X 2.1 + 10.8(234)35.6-5X 1.73(227)8.45 0.45 X 0.1(235) (1.1 0.78) X ( 2.7 1.95)(228)0.73 X 102(236) 1.3 X 0.75 X4(229) 7.8 X 5.6+2.3 X 4.4(237)1.08 +1.8 X 1.2(238)50.4 X 1.9 - 1.8(230) 76.3 X 27 - 76.3 X 17.(239)0.82 X 0.25+1.18
19、 X 0.25 .(247)3.4+ (1.2+0.5) X 5(240)8.5X (2.36+2.42) + 0.25(248)8X ( 20- 1.25)(241)3.9+ (1.3+0.6) X 6 3.6(249)0.654+10.9X6.5(242)4.25X6.3+3.7X4.25(250)22.7X1.25X 0.8243)205 0.99(251)3.91 X 2.8+6.09 X2.8.(244)25.6- 7.49- 2.51(252)6.23+3.09=(245)2.5 (6.8 4.9) X0.8.(253)132.4- 59.8=(246)102X4.5(254)6.
20、62X0.84=(255)2.07+0.023=(263)13.25 0.8+1.75 T.2 ;(264)2.5 X 99+2.5;(256)20.026 - (8.6+9.7 ) X 0.92 +30.19.(257)0.125X 32X2.5(265)10.36+4.8 - 16.5 -5;(266)12.5 X2.4.(258)0.8X 6.3- 0.8X 3.8(259)50.4+3.2X2.08(267)38.78 - 19.59+41.22 - 30.41(260)204+ ( 3.4X 0.5)(268)2.74 X 4.86+4.86 X 6.26+4.86(261)(43.
21、26+2.34) + 7.5(269)0.08 X ( 12.5+2.5 ) X 0.1(262)(20 0.8X 9) X 5.7.(270)25.92+ (10.1 - 14.5 X 0.2 )(271)0.487 X 12.5 +48.7(274)12.5X (7.2 1.9) X 0.8(273)1.56 X 1.7+0.44 X 1.7参考答案：(1) 0.11 X 1.8+8.2 X 0.11 , =0.11 X ( 1.8+8.2 ), =0.11 X 10, =1.1 ;(2) 2.34 X 99+2.34 ,=2.34 X ( 99+1),=2.34 X 100, =234;
22、(3) 5.4 +2.7 X 0.8 ,=2X 0.8 , =1.6 ;(4) 132X101 ,=132 X ( 100+1), =132X 100+132, =13332;(5) 6.25 + 1.25 +0.8 , =6.25 + ( 1.25 X 0.8 ), =6.25 + 1 , =6.25 ;(6) 2.5 X16,=(2.5 X4) X 4, =40 6.33X 101 - 6.33,=6.33 X (101-1),=6.33 X 100, =633;(8) 1.56X 1.7+0.44X 1.7,=1.7 X ( 1.56+0.44),=1.7X 2,=3.4;(275)0.
23、25 X 2010+20.10 X 75(272)(8.16+2.09 ) + (10.3 -9.3) + 0.4.(276) 30.8+ (6.34 4.59) X 4.(277) 1.8X (3.41 -2.9) + 0.03,=1.8 X 0.51 +0.03,=1.8X17,=30.6;(278) 0.125X 32X 2.5,=(0.125X8) X ( 4X2.5),=1 X 10,=10(279) 1.258 X 18.5 - 0.258 X 18.5 ,=18.5 X ( 1.258 - 0.258 ),=18.5 X 1 ,=18.5 ;(280) 8.48 +0.8 X0.
24、9 ,=10.6 X 0.9 ,=9.54 ;(281) 1.25 X2.4 ,=1.25 X 8X 0.3 ,=10X 0.3 ,=3；(14) 5.85 + ( 1.3+0.5 ) X 6,=5.85 + 1.8 X6,=3.25 X6,=19.5(15) 17.17 - 6.8 - 3.2 - 6.17=(17.17 -6.17) - ( 6.8+3.2 ),=11-10,=1；(16) 5.4 X (1.3+2.15 ) + 0.2=5.4 X 3.45 + 0.2,=5.4 X 17.25 ,=93.15 ;(17) 8.4 - 0.6+8.4 -0.4=14+21=35;(18)
25、16.8 x 10.1=16.8 x 10+16.8 x 0.1 ,=168+1.68 ,=169.68 ;(19) 10.9 - 0.9 -0.2+1.8=10.9 - 4.5+1.8 ,=8.2 ;(20) 1.25 X 3.2 X 0.25=(1.25 X 0.8) X ( 4X 0.25 ),=1X1,=1(21) 1.36+4.85+2.64+6.15 ,=(1.36+2.64 ) + (4.85+6.15 ),=4+11,=15;(22) 98.5 -2.5 +4,=98.5 + ( 2.5 X4),=98.5 - 10,=9.85 ;(23) 5.4 -2.5 X (3.7 -
26、2.9 ), =5.4 - 2.5 X 0.8, =5.4 +2, =2.7 ;(24) 0.8 X ( 4- 3.68 ) + 0.01 ,=0.8 X 0.32 -0.01 ,=0.256 -0.01 ,=25.6 ;(25) 83.7 - 12.83 - 0.17 ,=83.7 - ( 12.83+0.17 ),=83.7 - 13,=70.7 ;(26) 5.96+13 X ( 3.2 - 3.12 ),=5.96+13 X0.08 ,=5.96+1.04 ,=7.(27) 4.32 -2.4 X 1.7 ,=1.8 X 1.7 ,=3.06 ;(28) 16.2 X4.5+3.8 X
27、 4.5 ,=(16.2+3.8 ) X 4.5 ,=20X4.5 ,=90;(29) 9.05 - 3.86 -3.14 ,=9.05 - ( 3.86+3.14 ),=9.05 - 7,=2.05 ;(30) 7.28+0.72 -0.9 , =7.28+0.8 , =8.08(31) 4.32+5.43+6.68 , =4.32+6.68+5.43 , =11+5.43 , =16.43 ;(32) 17.17 - 6.8 - 3.2 ,=17.17 - ( 6.8+3.2 ),=17.17 - 10, =7.17 ;(33) 5.29 X 9+5.29 ,=5.29 X ( 9+1),
28、=5.29 X 10,=52.9 ;(34) 16.8 X 10.1 , =16.8 X 10+16.8 X 0.1 , =168+1.68 , =169.68 ;(35) 2.74 X 9.5+5 X 0,274 , =2.74 X 9.5+0.5 X 2.74 , =2.74 X ( 9.5+0.5 ), =2.74 X 10, =27.4 ;(36) 0.36+9.6 -3.2 , =0.36+3 , =3.36(37) 3.75 X 25+6.25 X 25,=25 X ( 3.75+6.25 ), =25X10, =250;(38) 25.46 - 8.23 - 1.76 ,=25.
29、46 - ( 8.23+1.76 ), =25.46 - 9.99=15.45 ;(39) 2.9+7.1 X 10,=2.9+71 , =73.9 ;(40) 1.25 X 32X 0.25=(1.25 X 8) X ( 4X 0.25 ),=10X 1, =1.(41) 15.68 - ( 7.78 - 4.32 ) - 2.32 , =15.68 - 7.78+4.32 - 2.32 , =(15.68+4.32 ) - ( 7.78+2.32 ), =20- 10, =10;(42) 0.25 X 3.2 X 1.25 ,(53) 3.6+6.4 X1.8,=3.6+11.52 ,=1
30、5.12 ;(54) (1.48+3.02 ) + ( 3.6 X 0.5),=4.5 + 1.8 ,=2.5 ;(55) (36.7 - 4.9) X 101 - 31.8 ,=31.8 X 101 - 31.8 ,=31.8 X (101-1),=31.8 X 100,=3180(56) 6.33 X 101 - 6.33=6.33 X (101-1),=6.33 X 100,=633;(57) 35.6 - 5X 1.73 ,=35.6 - 8.65 ,=26.95 ;(58) 1.6 X 55.4 - 55.4 X 0.6 ,=55.4 X ( 1.6 -0.6 ),=55.4 X 1
31、 ,=55.4 ;(59) 17.68 + 5.2+2.7 X1.5 ,=3.4+4.05 ,=7.45(60) 1.08 X 0.8 +0.27=1.08 +0.27 X 0.8 ,=4X 0.8 ,=3.2 ;(61) 102X0.45=(100+2) X 0.45 ,=100 X 0.45+2 X0.45 ,=45+0.9 ,=45.9 ;(62) 22.78 + 1.25 +0.8=22.78 + ( 1.25 X 0.8 ),=22.78 + 1,=22.78 ;(63) 0.34 X 101 - 0.34=(101 - 1) X 0.34 ,=100 X 0.34 ,=34(64)
32、 0.125 X 32X2.5 ,=(0.125 X 8) X ( 4X 2.5),=1X 10,= 10;(65) 0.8 X6.3 - 0.8 X 3.8 ,=0.8 X ( 6.3 - 3.8),=0.8 X2.5 ,=0.25 X 4X0.8 X 1.25 ,=(0.25 X 4) X ( 0.8 X 1.25 ),= 1X1,=1;(43) 9.99 X 1.01 ,=(10-0.01 ) x 1.01 ,=10.1 - 0.0101 ,=10.0899 ;(44) 4.63 X 1.4+46.3 X 0.86 ,=46.3 X 0.14+46.3 X 0.86 ,=46.3 X (
33、 0.14+0.86 ),=46.3 X 1 ,=46.3 ;(45) 17.5 +0.8 +12.5 ,=17.5 + ( 0.8 X 12.5 ),=17.5 + 1 ,=17.5 ;(46) 0.9+9.9+99.9+999.9 ,=1 - 0.1 + 10 - 0.1 + 100 - 0.1+1000 - 0.1 ,= (1 + 10+100+1000) - ( 0.1+0.1+0.1+0.1 ),=1111 - 0.4 ,=1110.6(47) 2.9 X 99+2.9=(99+1) X 2.9 ,=100X2.9 ,=290;(48) 25X11.2 X 4=25X4X 11.2
34、,=100 X 11.2 ,=1120;(49) 23.25 - 6.75 - 3.25=23.25 - (6.75+3.25 ),=23.25 - 10,=13.25(50) 125X 3.2 X 2.5 ,=125X 8X 0.4 X 2.5 ,=(125X8) X ( 0.4 X2.5 ),=1000X 1,=1000;(51) 3.6 X 10.1 ,=3.6 X (10+0.1 ),=3.6 X 10+3.6 X 0.1 ,=36+0.36 ,=36.36 ;(52) 5.8 X 2.7+0.58 X 73,=5.8 X 2.7+5.8 X 7.3 ,=5.8 X ( 2.7+7.3
35、 ),=5.8 X 10,=58;二2；(66) 504+3.2 X 2.08 ,=157.5 X 2.08 ,=327.6 ;(67) (20- 0.8 X 9) X 5.7 ,=(20 - 7.2 ) X 5.7 ,=12.8 X 5.7 ,=72.96(68) 2.4 X 1.5+3.6 -1.5 ,=3.6+2.4 , =6；(69) 7.38 - 5.14+3.62 - 2.86 , =(7.38+3.62 ) - ( 5.14+2.86 ), =11 - 8, =3；(70) 0.12 X 1.8+8.2 X 0.12 ,=0.12 X ( 1.8+8.2 ),=0.12 X 10
36、,=1.2 ；(71) 5.4 + 0.51 + ( 1.2 1.03 ),=5.4 + 0.51 +0.17,=5.4 +3,=1.8 ;(72) (8.15.6) X 0.9 - 1.05 +0.04, =2.5 X 0.9 - 1.05 +0.04 , =2.25 - 1.05 +0.04, =1.2 +0.04 , =30(73) 10.8 - 0.8 + ( 0.35+0.05 ),=10.8 - 0.8 +0.4 ,=10.8 - 2,=8.8 ;(74) 8X 1 + ( 2.3 - 2.25 ),=8X 1 +0.05,=8X20,=160;(75) 2.64 X 9.9+0.
37、264 ,=0.264 X 99+0.264 ,=0.264 X (99+1),=0.264 X 100,=26.4 ;(76) 4.52+0.61+1.39+6.48 =(4.52+6.48 ) + (0.61 + 1.39 ), =11+2, =13;(77) 4.27 - ( 1.96 - 1.73 )=4.27 - 0.23 ,=4.04 ;(78) (294.4 - 19.2 X 6) + ( 6+8)=(294.4 115.2 ) + 14, =179.2 + 14, =12.8 ;(79) 12.5 X 0.76 X 0.4 X 8X 2.5=(12.5 X 8) X ( 0.4
38、 X 2.5 ) X 0.76 , =100 X 1 X 0.76 , =76.(80) 4.98+8.02 X 2.5 , =4.98+20.25 , =25.03 ;(81) 60.8 - 40.8 +2.5 ,=60.8 - 16.32 ,=44.48 ;(82) 0.8 X 69.6 X 12.5 ,=(0.8 X 12.5 ) X 69.6 ,=10X69.6 ,=696;(83) 4.98 X 99+4.9 , =493.02+4.9 , =497.92 ;(84) 6.48 +3.2 +2.5 ,=6.48 + ( 3.2 X2.5 ),=6.48 +8,=0.81 ;(85) 1.2 X 7.6+7.6 X 6.8 ,=7.6 X ( 1.2+6.8 ),=7.6 X 8,=60.8(86) (9.4 5.8) 2.07,=3.6X2.07,=7.452;(87) 12.54- 4.56- 3.44- 1.54,=(12.54 1.54) ( 4.56+3.44),=11 - 8,=3；(88) (9.36X5+9.36+9.36 2) M.25,