1.2/y+3y/y-1=3 两边乘以y(y-1)得2y-2+3y²=3y²-3y5y=2∴y=2/5检验：y=2/5是方程的解2.x+1/x-1-4/x²-1=1 两边乘以(x+1)(x-1)得x²+2x+1-4=x²-12x=2x=1检验：x=1是增根3.2/x-1=4/x²-1两...