4.8×0.63 0.5×6.3用简便方法
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2016-09-13
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4.8×0.63 + 0.5×6.3
=4.8×0.63 + 5×0.63
=9.8*0.63
=(10-0.2)*0.63
=10*0.63-0.2*0.63
=6.3-0.126
=6.174
=4.8×0.63 + 5×0.63
=9.8*0.63
=(10-0.2)*0.63
=10*0.63-0.2*0.63
=6.3-0.126
=6.174
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