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解log81(X)+log9(X)+log3(X) < 7/4
人气:298 ℃ 时间:2020-05-18 20:16:53
解答
log81(X)+log9(X)+log3(X) < 7/4
log3^4(x)+log3^2(x)+log3(x)<7/4
1/4log3(x)+1/2 log3(x)+ log3(x)<7/4
7/4 log3(x)<7/4
log3(x)<1
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