简便运算:56.5*99 56.

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简便运算:56.5*99 56.
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简便运算:56.5*99 56.
简便运算:56.5*99 56.

简便运算:56.5*99 56.
:56.5*99+ 56.5=56.5*(99+1)==56.5*100==5650

56.5*99 56.5=56.5*(9900+56.5)=559350+3192.25=562542.25