铃木怎么样:数学题目
来源:百度文库 编辑:高校问答 时间:2024/10/06 14:49:56
解:x/(x-2)+(x-9)/(x-7)=(x+1)/(x-1)+(x-8)/(x-6)
x/(x-2)+(x-9)/(x-7)=(x+1)/(x-1)+(x-8)/(x-6)
x/(x-2)-(x+1)/(x-1)=(x-8)/(x-6)-(x-9)/(x-7)
2/[(x-2)*(x-1)]=2/[(x-6)*(x-7)]
(x-2)*(x-1)=(x-6)*(x-7)
x=4
:x/(x-2)+(x-9)/(x-7)=(x+1)/(x-1)+(x-8)/(x-6)
1+2/[x-2]+1-2/[x-7]=1+2/[x-1]+1-2/[x-6]
1/[x-2]-1/[x-7]=1/[x-1]-1/[x-6]
[x-7-x+2]/[x-2][x-7]=[x-6-x+1]/[x-1][x-6]
1/[x-2][x-7]=1/[x-1][x-6]
x=4