46.4-54.2+83.6-45.5怎么用简便方法计算?

问题描述:

46.4-54.2+83.6-45.5怎么用简便方法计算?

46.4-54.2+83.6-45.5
=46.4+83.6-(54.2+45.5)
=130-(100-0.3)
=130-100+0.3
=30.3

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