先化简,在求值,(X-2-X+2分之5)/2x*4分之x-3_数学解答

先化简,在求值,(X-2-X+2分之5)/2x*4分之x-3

人气：311 ℃　时间：2020-06-17 21:44:42

解答

,(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