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19.6减5分之7减5分之13等于多少? 12.7减括号2.7减...

7/12-(3/8+1/6) =7/12-(9/24+4/24) =14/24-13/24 =1/24 4/5+1/4-19/20 =16/20+5/20-19/20 =2/20. =1/10 1又2/15+3/5-1 =1+2/15+3/5-1 =2/15+3/5 =2/15+9/15 =11/15

等于十九分之七加十九分之十等于十九分之十七

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