log2(x – 2 ) + 2 = log2(5)log2(x – 2 ) + 2 = log2(5)

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log2(x – 2 ) + 2 = log2(5)log2(x – 2 ) + 2 = log2(5)
log2(x – 2 ) + 2 = log2(5)
log2(x – 2 ) + 2 = log2(5)

log2(x – 2 ) + 2 = log2(5)log2(x – 2 ) + 2 = log2(5)

原式=log2(5)-log2(x-2)=2.(1)
由logA(M/N)得:
log2[5/(x-2)]=log2(4),即:
5/(x-2)=4,
解得;x=3.25

13/4


原式=log2(5)-log2(x-2)=2...........(1)
由logA(M/N)得:
log2[5/(x-2)]=log2(4),即:
5/(x-2)=4,
解得;x=3.25