58.2+39.6+42.8×2简便运算?
2个回答
2022-09-20
展开全部
58.2+39.6+42.8×2
=58.2+42.8+39.6+42.8
=101+(39.6+0.4)+(42.8-0.4)
=101+40+42.4
=183.4
=58.2+42.8+39.6+42.8
=101+(39.6+0.4)+(42.8-0.4)
=101+40+42.4
=183.4
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