在把分式方程1/2(1-x)+1/(x+1)=-1/6(x²-1)化为正式方程时,方程两边同乘的整式是(A)12(1-x)(x+1)(x²-1)(B)2(x+1)(x²-1)(C)6(x-1)(D)6(x-1)(x+1)

问题描述:

在把分式方程1/2(1-x)+1/(x+1)=-1/6(x²-1)化为正式方程时,方程两边同乘的整式是
(A)12(1-x)(x+1)(x²-1)
(B)2(x+1)(x²-1)
(C)6(x-1)
(D)6(x-1)(x+1)

x²-1=(x+1)(x-1)
2和6,公倍数6
所以选D