【(x+2)/(x²-2x)-(x-1)/(x²-x+4)】/(x-4)/x
=【(x+2)/x(x-2)-(x-1)/(x²-x+4)】*x/(x-4)
=(x+2)/x(x-2)*x/(x-4)-(x-1)/(x²-x+4)*x/(x-4)
=(x+2)/(x-2)(x-4)-x(x-1)/(x²-x+4)(x-4) 最简公分母(x-2)(x-4)(x²-x+4)
=(x+2)(x²-x+4)/(x-2)(x-4)(x²-x+4)-x(x-1)(x-2)/(x-2)(x-4)(x²-x+4)
=[(x+2)(x²-x+4)-x(x-1)(x-2)]/[(x-2)(x-4)(x²-x+4)]
分子展开合并同类型化解即可
计算过程挺复杂的,如果你题目没有抄错的话我想原题有问题