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4.9乘10.1用简便方法怎么计算

4.9x10.1 =4.9x(10+0.1) =4.9x10+4.9x0.1 =49+0.49 =49.49

4.9✘10.1简便计算 =4.9x10+4.9x0.1 =49+0.49 =49.49

=0.49×10×10.1-0.49 =0.49×101-0.49 =0.49×(101-1) =0.49×100 =49

10.1×4.9 =(10+0.1)×4.9 =10×4.9+0.1×4.9 =49+0.49 =49.49

4.9*10.1 =4.9x(10+0.1) =4.9x10+4.9x0.1 =49+0.49 =49.49

解: 4.9%×(1+10%) =4.9%×1+4.9%×10% =4.9%+0.49% =5.39%

(1-x)平方=0.49 1-x=±0.7 1-x=0.7,x1=0.3 1-x=-0.7,x2=1.7

用到的是惩罚的分配法。

4.9+5.1-4.9+5.1 =(4.9-4.9)+(5.1+5.1) =10.2

10一4.9=?竖式 10-4.9=5.1

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