12.5×5.5 62.5×0.9巧算
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12.5x5.5
=(12+0.5)(5+0.5)
=60+6+2.5+0.25
=68.75
62.5x0.9
=(60+2.5)(1-0.1)
=60-6+2.5-0.25
=62.5-6.25
=56.25
=(12+0.5)(5+0.5)
=60+6+2.5+0.25
=68.75
62.5x0.9
=(60+2.5)(1-0.1)
=60-6+2.5-0.25
=62.5-6.25
=56.25
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展开全部
12.5*5.5
=12.5*2*(5.5*2)/4
=25*11/4
=275/4
=68.75
62.5*0.9
=62.5*(1-0.1)
=62.5-6.25
=56.25
=12.5*2*(5.5*2)/4
=25*11/4
=275/4
=68.75
62.5*0.9
=62.5*(1-0.1)
=62.5-6.25
=56.25
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