不要检验!1.x+1/x-1-3x-3/x+1=22.7/x^2+x+3/x^2-x=6/x^2-1

Question

不要检验!
1.x+1/x-1 - 3x-3/x+1 = 2
2.7/x^2+x + 3/x^2-x = 6/x^2-1

Answer 1

（1）.[(X+1)"2]/[(X-1)(X+1)]-[3*(X-1)"2]/[(X-1)(X+1)]=2 (X"2+1+2X-3*X"2-3+6X)/(-1)(+1)=2 -2X"2+8X-2=2X"2-2 X=0或2