9^m=3,9^n=4,求m,n的值
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9^m=3,9^n=4,求m,n的值
9^m=3,9^n=4,求m,n的值
9^m=3,9^n=4,求m,n的值
9^m=3,所以m=1/2
9^n=4,所以n=log(9)4=0.6309
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