7/x^2+x-6/x^2-1+3/x^2-x=0 7/x（x+1）-6/(x+1)(x-1)+3/x(x-1)=0 两边乘x（x+1）（x-1）7(x-1)-6x+3(x+1)=07x-7-6x+3x+3=04x-4=04x=4x=1由于x≠1所以方程无解
7/x²+x-6/x²-1+3/x²-x=0化简(7-6+3)/x²+x-x-1=04/x²=1解得x=±1/2
