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(9.5%1.2x4)x0.6简算

=2.9×(5.137+4.633) =2.9×10 =29

9分之1x5分之4x2+9分之2x5分之1x4简便运算 =1/9x2x4/5+2/9x(1/5x4) =2/9x4/5+2/9x4/5 =8/45+8/45 =16/45

①1/5(x-8)+1/4x+x-1/7=6-23-x/5 解:28﹙x-8﹚+35x+20﹙x-1﹚=840-28﹙23-x﹚ 28x-224+35x+20x-20=840-644+28x 55x=440 ∴x=8 ②3(0.7x+0.1)+2(0.25x-0.2)=5.1 2.1x+0.3+0.5x-0.4=5.1 2.6x=5.2 ∴x=2 ③(1.2+x)/0.4-(0.5x+1)/。

1。14.5+7.65x4+25.5+2.35x4+40 =14.5+29.5+25.5+9.4+40 =80+38.9 =118.9 2。3.5÷(0.7÷0.5) =3.5/1.4 =3.5/(7/5) =4.9 3。(3.6x7.5x0.54)÷(1.2x1.5x0.9) =14.58/1.62 =9

如图

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