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0.67x7.5的简便计算

0.67x7.5列脱式计算 解:采用分配律,原式=0.67x7.5=0.67x(7+0.5)=0.67x7+0.67x0.5=4.69+0.335=5.025

67是质数,75可以拆成3*25, 0.67*7.5=0.001*[(100-33)*75] =0.001*(7500-33*(100-25)) =0.001*(7500-3300-25*3*11) =0.001*(7500-3300-75*11) =0.001*(7500-3300-825) 剩下就很好算了

67*750/1000=5.025

把7.5分成7和0.5,再分开成

6.7x75=502.5

0.67*7.5=0.67*(7+0.5)=0.67*7+0.65*0.5=4.69+0.325=5.015

[7+0.5]*0.67 7*0.67+0.5*0.67 4.69+0.335 5.025

0.67x7.5=(0.7-0.03)x7.5=0.7x7.5-0.03x7.5=5025-0.225=5.025

原式=(0.6+0.07)*7.5=0.6*7.5+0.07*7.5=4.5+0.525=5.025

0.67x7.5=0.67*(7+0.5)=0.67*7+0.67*0.5=4.69+0.335=5.025

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