7.5×2.3+1.9×2.5+12.5×0.4用简便方法计算
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7.5x2.3+1.9x2.5+12.5x0.4
=2.5x3x2.3+1.9x2.5+2.5x5x0.4
=2.5x(6.9+1.9+2)
=2.5x10.8
=2.5x(10+0.8)
=2.5x10+2.5x0.8
=25+2
=27
=2.5x3x2.3+1.9x2.5+2.5x5x0.4
=2.5x(6.9+1.9+2)
=2.5x10.8
=2.5x(10+0.8)
=2.5x10+2.5x0.8
=25+2
=27
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展开全部
7.5*2.3+1.9*2.5+12.5*0.4
=2.5*3*2.3+1.9*2.5+2.5*5*0.4
=2.5*(6.9+1.9+2)
=2.5*10.8
=2.5*(10+0.8)
=2.5*10+2.5*0.8
=25+2
=27
=2.5*3*2.3+1.9*2.5+2.5*5*0.4
=2.5*(6.9+1.9+2)
=2.5*10.8
=2.5*(10+0.8)
=2.5*10+2.5*0.8
=25+2
=27
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