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根據冪的運算性質,3的2m+3n次防等於3的2m次方與3的3n次方之乘積.3的2m次方等於3的m次方的平方即5的平方,25.同理知3的3n次方為8.所以最後得200
a^2m-3n =a^2m÷a^3n =(a^m)²÷(a^n)³ =3²÷2³ =9÷8 =9/8
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