来自安利娟的问题
3/((x-2)(x+1))-(1/(x-2))2/(a²-1)+1/(a+1)x/(2-x)-(4-x²)/(x²-4x+4)
3/((x-2)(x+1))-(1/(x-2))
2/(a²-1)+1/(a+1)
x/(2-x)-(4-x²)/(x²-4x+4)
1回答
2020-09-3011:46
3/((x-2)(x+1))-(1/(x-2))2/(a²-1)+1/(a+1)x/(2-x)-(4-x²)/(x²-4x+4)
3/((x-2)(x+1))-(1/(x-2))
2/(a²-1)+1/(a+1)
x/(2-x)-(4-x²)/(x²-4x+4)
3/((x-2)(x+1))-(1/(x-2))=3/((x-2)(x+1))-(x+1)/(x-2)(x+1)=(3-x-1)/((x-2)(x+1)=(2-x)/(x-2)(x+1)=-1/(x+1)2/(a²-1)+1/(a+1)=2/(a²-1)+(a-1)/(a+1)(a-1)=(2+a-1)/((a²-1)=(a+1)/((a²-1)=1/(a-1)x/(2-x)-(4-x²)/(x²-4x+4)=-x(x-2)/(x²-4x+4)-(4-x²)/(x²-4x+4)=(-x²+2x-4+x²)/(x²-4x+4)=-2(x-2)/(x²-4x+4)=-2/(x-2)=2/(2-x)