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9的m-n次方
=(3²)^(m-n)
=3^(2m-2n)
=3^2m/(3^n)²
=5/100
=1/20
9的2m-n次方
=(3²)^(2m-n)
=(3^2m)²/(3^n)²
=5²/10²
=1/4
=(3²)^(m-n)
=3^(2m-2n)
=3^2m/(3^n)²
=5/100
=1/20
9的2m-n次方
=(3²)^(2m-n)
=(3^2m)²/(3^n)²
=5²/10²
=1/4
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展开全部
3^2m=5 3^m=√5
3^n=10
9^(m-n)=3^(2m-2n)=(3^2m)/(3^n)^2=5/100=1/20
9^(2m-n)=3^(4m-2n)=3^4m/3^2n=(3^2m)^2/(3^n)^2=25/100=1/4
3^n=10
9^(m-n)=3^(2m-2n)=(3^2m)/(3^n)^2=5/100=1/20
9^(2m-n)=3^(4m-2n)=3^4m/3^2n=(3^2m)^2/(3^n)^2=25/100=1/4
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