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6.8÷0.5 4.2÷0.25 2.1÷0.2 1.9÷0.1 6.8×2 4.2×4 2.1X

等等我来。

2.1(x-0.7)=4.2 解:x-0.7=4.2/2.1 x-0.7=2 x=2+0.7 x=2.7

解: 0.5x+1.2=6.2 0.5x=6.2-1.2 0.5x=5 x=5÷0.5 x=10 检验:把x=10代入等左右两边, 左边=0.5x+1.2 =0.5×10+1.2 =5+1.2 =6.2 右边=6.2 所以左边=右边, 所以x=10是原方程的解。

1.64x2.5 =1.64/4x10 =4.1 2.1/0.6 =2.1/3/0.2 =0.7/0.2 =3.5

0.1/(0.2/0.3)/(03/0.4)/(0.4/0.5) =0.1÷0.2x(0.3÷0.3)x(0.4÷0.4)x0.5 =0.5x1x1x1x0.5 =0.25

过程如下: 1÷0.25x(1.28÷3.2) =1÷0.25x1.28÷3.2 =1÷0.32÷3.2 =1÷0.1 =10

1.2X一5.6=0.4 1.2X=5.6+0.4 1.2X=6 X=6÷1.2 X=5 希望采纳

解:0.2÷0.1x0.01÷0.05 =0.2x0.01/(0.1x0.05) =2/5 =0.4

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