3.8乘10.1的简便运算脱式

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3.8乘10.1的简便运算脱式
3.8乘10.1的简便运算
脱式

3.8乘10.1的简便运算脱式
3.8 x 10.1
=3.8x(10+0.1)
=3.8x10+3.8x0.4
=38+0.38
=38.38

3.8*10.1
=3.8*(10+0.1)
=38+0.38
=38.38 .

(4-0.2)*(10+0.1)=40+0.4-2-0.02=38.38

(4-0.2)*(10+0.1)=40-2+0.4-0.02=38.38
???????

3.8x10.1
=3.8x(10+0.1)
=38+0.38
=38.38