2.5*0.39+0.25用简便方法计算
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2.5*0.39+0.25
=2.5*0.39+2.5*0.01
=2.5*(0.39+0.01)
=2.5*0.40
=1
=2.5*0.39+2.5*0.01
=2.5*(0.39+0.01)
=2.5*0.40
=1
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=2.5*0.39+0.25*0.01
=2.5*(0.39+0.01)
=2.5*0.4
=1
=2.5*(0.39+0.01)
=2.5*0.4
=1
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没有更好的办法,计算强度差不了多少。
观察0.25和2.5,将0.25改写成2.5*0.1
原式=2.5*0.39+2.5*0.1
=2.5*(0.39+0.1)
=2.5*0.49
=2.5*(0.5-0.01)
=2.5*0.5-2.5*0.01
=1.25-0.025
=1.225
观察0.25和2.5,将0.25改写成2.5*0.1
原式=2.5*0.39+2.5*0.1
=2.5*(0.39+0.1)
=2.5*0.49
=2.5*(0.5-0.01)
=2.5*0.5-2.5*0.01
=1.25-0.025
=1.225
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2.5*0.39+0.25=0.25*10*0.39+0.25=0.25*(3.9+0.1)=0.25*4=1
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