已知0已知0
已知0(1):y'=-4/x2+1/(1-x)2=-(3x-2)(x-2)/x2(1-x) 当0
求导得,y‘=-4/x²+1/(1-x)²= -(3x²-8x+4)/x²(1-x)²= -(3x-2)(x-2)/x²(1-x)²,由于x所以在0