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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

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

184乘以2,1 分成 100乘2,1 和84乘以2,1

2.1×2.1+4.2×7.9+7.9×7.9怎么简便计算 =2.1x2.1+2x2.1x7.9+7...

2.7×8点9+2点1×2点7-2点7 2.7×8.9+2.1×2.7-2.7 =2.7×(...

用简便方法计算 70/31x(-9/7)x(-2又1/15)x(-4又1/2) =-(70/31...

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

7.1-7.1+2.9+2.9 =5.8

2.1x+7.9x=0.28 (2.1+7.9)x=0.28 10x=0.28 x=0.028

2.9+7.1×10 =2.9+71 =73.9 2.9+0.71×10 =2.9+7.1 =10

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