7.2×0.48+0.72×2.9+0.072×23的简便方法?
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2020-03-19 · 汽车新能源、机电维修、钣喷美等培训学校
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7.2×0.48+0.72×2.9+0.072×23
=0.72×4.8+0.72×2.9+0.72×2.3
=0.72×(4.8+2.9+2.3)
=0.72×10
=7.2
=0.72×4.8+0.72×2.9+0.72×2.3
=0.72×(4.8+2.9+2.3)
=0.72×10
=7.2
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