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1、2018-4小学四年级运算定律的 简算和混合运算练习题四年级下册数学应用运算定律简算专项练习题姓名:1、我会填400X X 8 = 400X (15X8)(a x b) x c = a x (x)35X= 46X45X 5X 4 = 45 X (X) 125X32X25 = (125X)X (X)ax b =x2、符合乘法交换律的画。符合结合律的画35X28=28X35() 32 X25=8 X (4 X 25)() 25X 15X4X2=(15X2)X(25X4)() aXbXc=aXcXb()3、算一算，想一想，你有什么发现？(1)30X2X5=30 X (2X5)=我 发现：(2)25
2、X16 X4=(25 X4)X16= 我发现4、连一连45X1818+(55+45)5、简算33 X 15X225 X7X4X325 X 50 X 825 X 125X 16125X25 X 132X254 X (25 X9)162538 X5X45X(189 X2)4 X45X2525 125 X72(23X(25 X25) X125)X32(30 X 25)X40(15415 X (25 X 4)6X (12X5)5X (13X20)(6X12) X5(13X5) X20125X48X25) X435X2X5125X5X8(6064X12525X35X16125X32125X24125X1
3、656X12516X2525X12836X2525X24X525X1228X25六、解决问题。1、龙口菜市场进了 56箱鸡蛋，每箱25千克，每千克鸡蛋 8元，这些鸡蛋一共可卖多少钱?2、在学校举行的体操表演中，一共有关5个方阵参加表演, 每个方阵有18行，每行都有20名同学，一共有多少名同 学？3、有8个书架，每个书架都有7层，每层可放125本书, 这些书架一共可放多少本书？怎样简便就怎样算。702-54-46600-137-633600+217+8367+42+33 + 58258 58 2674125X1650 X(2X4) X257X8X3X 12539 X 139 X26X103501
4、 X 124+61X14532-128-7214+61X14627+48+173+1225X (40+8)163X8+37X8368-129-7202X177X4X527X9948X25098 + 30349+49X4955X25+25X45123X67-23X6739 X 101 3999X64+6476X23+24X2312 +19X1221 +254+79+4625 XX3716X552X32+48X32450+18420+ 35480+ 1521X9912X30175X3X418X137125X321819+99X19256X9-46X9(25+125) X843X201102X351
5、3+13X541X67-67X441304X22(30+4) X2538X7+62X7152X 8+148X816X401103X 237-56X748 X 101 48(30+2) X 15125X (8+16)68 X5)23 X63+48+68X25X27+63X564X9-14X9134 34X2398X3215X2 43 +43X3912X(4035X98102X4544X25648+ 2027X37+37X23256 X99X62+6241X99765+ 98560+ 16201X3436X25304+29718X45+18X55226X 13-26X 1315X301-15103
6、X3734X20175 X 141 7(30+8) X2525X65+25X 255X40125X2825X35+2571X23-71X13125X (808)101X898988X22+22X 1228X57+43X28202X4125X 19X4 47+99+4725X5X 1656 +56X4957X26+26X4199)48 X373X9-73X953+53125X16125(25+250) X427)18+82X27X2578X101-7825X124 24X25250X9X4250X224X250402X15199X9+1992X46+46X1840172 X 10142X (30
7、1)101X85-8525X19152X49+51X 1550X (60+8)93X99+9313X 15528 X3X12125X8125X 17+63X 12543X25X2111-28X 1120X55加减乘除四则运算125-25X6(135+75)X51024+ 16X324X25492 14563X8+91X63+6324X205士 (14 X5)(120-6010+ 5)128-6 X8+161200-20 X 18(135+415)+5+161200-20 X 18720-720+ 15(360-144)+24X3330+(65-50)(120X2+120) + 9164-13
8、X 5+8564X(12+65 +13)19X96-962+ 745940+ 45X(798-616)(3 (201015 X 40-364) + 7-906)X(65+15)12520 + 8 X (121(20+120+ 24) X 8106X+ 149-76X9117+13+36X 15(238+7560+ 90)21 X (230-192+ 4)735X (700-400+ 25)125-25 X 6(135+75)+(14 X 5)120-60 + 5 X 51024+ 16X3(135+415) + 5+161080 + (63-54)X 802100-94+48X 54240+4
9、80+ 30X2720-720+ 15(360-144)+ 24 X 3225-1(238+(528+912)X5-6178360 X 24+ 32+7300X (6+13)(120X2+120) + 97560-90)-14690+47X 52-398164-13 X 5+85330 + (65-50)128-6 X 8 + 1664 X (12+65 + 13)920-1680+ 40+ 79405-2940+ 28X2119X 96-962+7410000-(59+66)X 645940 +45 X (798-616)51+(2304-2042)X23(315 X 40-364) + 712520 + 8 X (121 + 11)(2010-906)X (65+15)4215+(4361-716)-8113+36X15(247+18)X27 + 253774 - 37 X (65+35)540-(148+47) + 13(308308 + 28) X 1121 X (230-192+ 4)