4.05+37.85简便运算怎么做

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4.05+37.85简便运算怎么做
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4.05+37.85简便运算怎么做
4.05+37.85简便运算怎么做

4.05+37.85简便运算怎么做
4.05 + 37.85
= 4 + 0.05 + 37 + 0.85
=(4+37)+(0.05+0.85)
=41+0.9
=41.9

4.05 + 37.85 = 4 + 0.05 + 37 + 0.85 = 41 + 1 = 42