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^表示次方 (4/7b^3-7ab^2+2/5b^2)÷2/5b^2 =(4/7÷2/5)b^(3-2)-(7÷2/5)ab^(2-2)+(2/5÷2/5)b^(2-2) =10/7 b-35/2 a+1 7分之10b-2分之35a+1
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