【解方程:x-5/x-6+x-8/x-9=x-7/x-8+x-6/x-7过程!】
<p>问题:【解方程:x-5/x-6+x-8/x-9=x-7/x-8+x-6/x-7过程!】<p>答案:↓↓↓<p class="nav-title mt10" style="border-top:1px solid #ccc;padding-top: 10px;">宋大为的回答:<div class="content-b">网友采纳 因为:x-5/x-6+x-8/x-9=x-7/x-8+x-6/x-7,所以:1+1/(x-6)+1+1/(x-9)=1+1/(x-8)+1+1/(x-7) 即:1/(x-6)+1/(x-9)=1/(x-8)+1/(x-7) 所以:1/(x-6)-1/(x-7)=1/(x-8)-1/(x-9) 所以:[(x-7)-(x-6)]/[(x-6)(x-7)]=[(x-9)-(x-8)]/[(x-8)(x-9)] 所以:(x-6)(x-7)=(x-8)(x-9) 即:x^2-13x+42=x^2-17x+72,则:4x=30,解得:x=15/2
页:
[1]