已知2^m•4^m•8^m=2^18,求m的值?
人气:494 ℃ 时间:2020-05-25 21:26:48
解答
即
2^m×4^m×8^m
=2^m×2^2m×2^3m
=2^(m+2m+3m)
=2^6m
=2^18
∴6m=18
∴m=3
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