先化简,在求值,(X-2-X+2分之5)/2x*4分之x-3
问题描述：
先化简,在求值,(X-2-X+2分之5)/2x*4分之x-3
答
,(X-2-X+2分之5)/ 2x+4分之x-3
=[(x-2)(x+2)-5]/(x+2) ×2(x+2)/(x-3)
=(x²-9) /(x+2)×2(x+2)/(x-3)
=(x+3)(x-3) /(x+2)×2(x+2)/(x-3)
=2(x+3)
=2x+6