7.25+2.5×3.8简便计算怎么写
2个回答
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7.25+2.5×3.8
=2.5×2.9+2.5×3.8
=2.5×(2.9+3.8)
=2.5×(4+2.7)
=2.5×4+2.5×(2+0.7)
=10+2.5×2+2.5×(0.4+0.3)
=15+2.5×0.4+2.5×(0.2+0.1)
=16+2.5×0.2+2.5×0.1
=16+0.5+0.25
=16.75
=2.5×2.9+2.5×3.8
=2.5×(2.9+3.8)
=2.5×(4+2.7)
=2.5×4+2.5×(2+0.7)
=10+2.5×2+2.5×(0.4+0.3)
=15+2.5×0.4+2.5×(0.2+0.1)
=16+2.5×0.2+2.5×0.1
=16+0.5+0.25
=16.75
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