已知9^m=3,9^n=4,则9^2m-n等于( )如题,请写出步骤.
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已知9^m=3,9^n=4,则9^2m-n等于( )如题,请写出步骤.
已知9^m=3,9^n=4,则9^2m-n等于( )
如题,请写出步骤.
已知9^m=3,9^n=4,则9^2m-n等于( )如题,请写出步骤.
9^2m-n
=9^2m÷9^n
=(9^m)^2÷9^n
=3^2÷4
=9/4
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