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递等式计算能巧算的要巧算865减65乘以2怎么做

865-65×2 =865-65-65 =800-65 =735

79×102-79 =79×(102-1) =79×(100+1) =7900+79 =7979

845-(355-155)=645

9.5*10.1 =9.5*10+9.5*0.1 =95+0.95 =95.95

=78*(32+67+1)=78*100=7800

58.3*1.25*8 =1.25*8*58.3 =10*58.3 =583

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