已知log2x+logx8=4,求x
7个回答
log2x+logx8=4
log2x+3logx2=4
log2x+3/log2x=4
令log2x=t
t^2-4t+3=0
t1=1,t2=4
log2x=1或log2x=4
x=2或16
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