解不等式log3(x^2-2x-3) <log3(x+7)大神们帮帮忙
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解不等式log3(x^2-2x-3) <log3(x+7)大神们帮帮忙
解不等式log3(x^2-2x-3) <log3(x+7)大神们帮帮忙
解不等式log3(x^2-2x-3) <log3(x+7)大神们帮帮忙
因为log3 x是增函数而且x-2x-3>0且x+7>0所以(x+1)(x-3)>0且x>-7x<-1或x>3且x>-7-7
解不等式(2+log3 x)log3 x>log3 (9x)3都是底数
解不等式log3(x^2-2x-3) <log3(x+7)大神们帮帮忙
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