2的3m-2n次方×5的3m-2n次方
=(2×5)的3m-2n次方
=10的3m-2n次方
=10的3m次方×10的-2n次方
=(10的m次方)³×(10的n次方)²分之1
=2³×3²分之1
=8×9分之1
=9分之8
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解:∵10^m=2,10^n=3
∴[2^(3m-2n)]*5^(3m-2n)=[2^(3m)]*[5^(3m)]*[2^(-2n)]*5^(-2n)]
={[(2*5)^m]^3}*[(2*5)n]^(-2)
=(2^3)*3^(-2)
=8/9
2的3m-2n次方乘以5的3m-2n次方,结果为10的3m-2n次方,即10的3m次方除以10的2n次方,就是2的3次方除以3的2次方,结果8/9,九分之八