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x^(2m-3n) =x^2m÷x^3n =(x^m)^2÷(x^n)^3 =5^2÷3^3 =25/27
3的2m-3n+1次方 =3的2m次方÷3的3n次方×3的1次方 =(3的m次方)²÷(的n次方)³×3 =5²÷2³×3 =75/8
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