
一道数学解方程,求老师学霸帮忙,谢谢!!
1个回答
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原式可化简为
[x+2/(x-3)]+[x+2/(x-9)]=[x+2/(x-5)]+[x+2/(x-7)]
两边同减去2x得
2/(x-3)+2/(x-9)=2/(x-5)+2/(x-7)
同除以2后通分得
(2x-12)/(x^2-12x+27)=(2x-12)/(x^2-12x+35)
(2x-12)[(x^2-12x+35)-(x^2-12x+27)]=0
2(x-6)*8=0
所以x=6
[x+2/(x-3)]+[x+2/(x-9)]=[x+2/(x-5)]+[x+2/(x-7)]
两边同减去2x得
2/(x-3)+2/(x-9)=2/(x-5)+2/(x-7)
同除以2后通分得
(2x-12)/(x^2-12x+27)=(2x-12)/(x^2-12x+35)
(2x-12)[(x^2-12x+35)-(x^2-12x+27)]=0
2(x-6)*8=0
所以x=6
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