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1、一、解方程。姓名：3X= 3X 2 = 712X=325%X + 15%X= 487165105X =30%3X =25X-0.25=150%X + 4 X = 3.6457245X 3=20 1X - 15%X = 68X2X = 3X 3 X12175448X 7 X=31X +1X = 4X+1 X=204X 6 2=28426436X5 =13.44X6383 X+1= 3X- 0.8 X = 16+64484 X 3 9 = 295X3 5 50.3633 5-X =4+0.7X=10221745122 X 1 122(X-2.6)=8213( X - 4.5) = 75X-X=33
2、431013130.375 X = 520 X 8.5= 1.51X( +)=XX - 25%X = 10681262X -4X -4= 2152二、简便运算。7134（ 12 -5 ） 6036350.65101（1.25-0.125） 8253824( 11 - 3 - 1 - 1 )812863(12+2 )71310.22.6997463627.53.7-7.5 3.77 11 + 7 5+77131395911773316731310 101-105 99 +5513-577 103-7 2-70.92 1.41 0.92 8.592525252.25 4.8+77.5 0.484.87.8+78 0.521.311.6 1.6 1.3227227 (15 28 ) 154.3612.5 82.5321.251.25 20.89.63.2 315.20.25 4388883333146.5-（ 23+46.5）9 99988312.89-(3.89-1.6)73.8-1.64-13.8-5.3615.75+3.59-0.59+14.255.48- （9.4-0.52 ）12.06 5.07 2.9430.349.76 10.344