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高一数学不等式,求教!谢谢!

来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/05/16 10:25:15
高一数学不等式,求教!谢谢!

 

1/(x+4)+1/(x+5)>1/(x+6)+1/(x+3)
1/(x+4)-1/(x+6)>1/(x+3)-1/(x+5)
2/[(x+4)(x+6)]>2/[(x+3)(x+5)]
1/[(x+4)(x+6)]>1/[(x+3)(x+5)]
1/[(x+4)(x+6)]-1/[(x+3)(x+5)]>0
{[(x+3)(x+5)]-[(x+4)(x+6)]}/[(x+4)(x+6)(x+3)(x+5)]>0
-(2x+9)/[(x+4)(x+6)(x+3)(x+5)]>0
(2x+9)/[(x+4)(x+6)(x+3)(x+5)]