2x/x+1+3/x-1=2.和5/2x+4-1/2-x=4/x2-4.和x/x-1=3/x2-1.解这三题的方程.,
问题描述:
2x/x+1+3/x-1=2.和5/2x+4-1/2-x=4/x2-4.和x/x-1=3/x2-1.解这三题的方程.,
答
⑴方程两边都乘以(X+1)(X-1),得:2X(X-1)+3(X+1)=2(X+1)(X-1),2X²-2X+3X+3=2X²-2X=-5.⑵方程两边都乘以2(X+2)(X-2),得:5(X-2)+2(X+2)=87X=14,X=2,⑶方程两边都乘以(X+1)(X-1),得:X(X+1)=3,X²+X-3=0...