3-x/x-2除以(x+2-5/x-2)
问题描述:
3-x/x-2除以(x+2-5/x-2)
答
原式=(3-x)/(x-2)÷[(x+2)(x-2)-5]/(x-2)
=-(x-3)/(x-2)*(x-2)/(x²-9)
=-(x-3)/(x-2)*(x-2)/(x+3)(x-3)
=-1/(x+3)