先化简,再求值:[x+2-(x-2分之5)]除以(x-2分之x-3),其中x=-2_数学解答

先化简,再求值:[x+2-(x-2分之5)]除以(x-2分之x-3),其中x=-2

人气：483 ℃　时间：2020-05-26 09:30:30

解答

原式=[(x+2)(x-2)-5]/(x-2)]×(x-2)/(x-3)
=(x²-9)/(x-2)×(x-2)/(x-3)
=(x+3)(x-3)/(x-2)×(x-2)/(x-3)
=x+3
=-2+3
=1�ⷽ�̣��x-1��֮��4x-1)=1-(1-x)��֮8��ʰ�