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6.9x8.9的简便运算怎么算

6.9x8.9的简便运算怎么算 6.9x8.9 =(7-0.1)*(9-0.1) =7*9-7*0.1-9*0.1+0.01 =63-1.6+0.01 =61.41

答案应该是:2.9

5x=8.45 x=8.45/5 x=1.69

4.3×6.9+4.3×2 =4.3x(6.9+2) =4.3x8.9 =4.3x10-4.3x1-4.3x0.1 =43-4.3-0.43 =43-4.73 =43-5+0.27 =38.27

1、 原式=7.9X(0.76+0.43-0.19)=7.9 2、原式=56.56 3、原式=2.37X2=4.74 4、5.12X(1+9)=51.2 5、0.3X4X0.25=0.3 6、0.25X0...

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