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尽量用简便方法24x896÷64139x0.125-59÷85/9-0.45+7/9-0.557/9÷11/5+2/9x5/11[1/2-(3/4)]÷7/10
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5/9+7/9-0.45-0.55=12/9-(0.45+0.55)=12/9-1=3/9
7/9÷11/5+2/9x5/11=7/9x5/11+2/9x5/11=5/11x(7/9+2/9)=5/11x1=5/11
[1/2-(3/4)]÷7/10=-1/4*10/7=-5/14
7/9÷11/5+2/9x5/11=7/9x5/11+2/9x5/11=5/11x(7/9+2/9)=5/11x1=5/11
[1/2-(3/4)]÷7/10=-1/4*10/7=-5/14
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