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7.9x2.1+2.1x2.1的简便计算。

7.9x2.1+2.1x2.1的简便计算=(7.9+2.1)x2.1=10x2.1=21

你好!7.9*2.1+2.1*2.1=(7.9+2.1)*2.1=10*2.1=21这是运用了加法结合律仅代表个人观点,不喜勿喷,谢谢.

7.9*2.8+2.8*2.1=(7.9+2.1)*2.8=10*2.8=28

2.1x1.9+7.9x1.9=1.9*(2.1+7.9)=1.9*10=19

6.2*2.1减2.1=6.2*2.1减2.1乘1=2.1*(1减6.2)=2.1乘3.8=7.98

7.9X2.1十21X0.21=7.9X2.1十2.1X2.1=(7.9十2.1)X2.1=10X2.1=21

原式=(39.1+0.9)*2.1=40*2.1=84

7.9*2.1+2.1*2.1=(7.9+2.1)*2.1=10*2.1=21

答:简便算法是:2.1x99十2.1=2.1x99十2.1X1=2.1X(99+1)=2.1X100=210

16.7-6.7x2.1=16.7-14.07=2.63

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