x²+x+1/x²-x-1=x²-x+2/x²+x-2 解分式方程,急用,
问题描述:
x²+x+1/x²-x-1=x²-x+2/x²+x-2 解分式方程,急用,
答
(x²+x+1)/(x²-x-1)=(x²-x+2)/(x²+x-2 )
[(x²-x-1)+2(x+1)]/(x²-x-1)=[(x²+x-2)-2(x-2)]/(x²+x-2 )
1+2(x+1)/(x²-x-1)=1-2(x-2)]/(x²+x-2 )
(x+1)/(x²-x-1)=-(x-2)/(x²+x-2 )
(x+1)/(x²-x-1)=-(x-2)/(x²+x-2 )
(x+1)(x²+x-2)=-(x-2)(x²-x-1)
x³+x²-2x+x²+x-2+x³-x²-x-2x²+2x+2=0
2x³-x²=0
x²(2x-1)=0
x=0
x=1/2
检验x=0 x=1/2是方程的解
答
根据以上方程得 x²+x+1/x²-x-1=x²-x+2/x²+x-2 ① x²-x-1≠0 ② x²+x-2≠0 ③由①得 (x&...