若2^n=9,4^m=3,求2^2n-4m+1=_____
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若2^n=9,4^m=3,求2^2n-4m+1=_____若2^n=9,4^m=3,求2^2n-4m+1=_____若2^n=9,4^m=3,求2^2n-4m+1=_____2^n=9,4^m=3(2
若2^n=9,4^m=3,求2^2n-4m+1=_____
若2^n=9,4^m=3,求2^2n-4m+1=_____
若2^n=9,4^m=3,求2^2n-4m+1=_____
2^n=9,
4^m=3
(2^2)^m=3
2^2m=3
2^2n-4m+1
=2^2n*2/2^4m
=(2^n)^2*2/(2^2m)^2
=9^2*2/3^2
=18
4^m=3--------两边取log得mlog4=log3
m=log3/log4
4m=4*(log3/log4)=log以四为底81,这上边写不出来
2^2n=81
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