a(a³-3a+2)<0a(a-1)²(a+2)<0∴ a(a+2)<0解得,-2<x<0
3/2x-4-x/x-2=1/2应该是3/(2x-4)-x/(x-2)=1/2,两边同乖(2x-4)(x-2)得,3(x-2)-x(2x-4)=(2x-4)(x-2)*1/26x-12-2x^2+8x=2x^2-8x+84x^2-22x+20x1=(11+41平方根)/4x2=(11-41平方根)/4