(x/x+1)²-2(x/x+1)-8=0
问题描述:
(x/x+1)²-2(x/x+1)-8=0
(2x²-1)/(x) +x/2x²-1=2
答
1、a=x/(x+1)a²-2a-8=0(a-4)(a+2)=0a=4,a=-2x/(x+1)=4x=4x+4x=-4/3x/(x+1)=-2x=-2x-2x=-2/3x=-4/3,x=-2/32、令a=(2x²-1)/x则a+1/a=2a²-2a+1=0(a-1)²=0a=1(2x²-1)/x=12x²-1=x2x²-...