先化简 再求值 (X2-4/X2-4X+4 - X-2/X+2) ÷X\X-2 其中X=2√3-2
问题描述:
先化简 再求值 (X2-4/X2-4X+4 - X-2/X+2) ÷X\X-2 其中X=2√3-2
答
[(X^2-4)/(X^2-4X+4)-(X-2)/(X+2)]÷[X/(X-2)]=[(x-2)(x+2)/(x-2)^2-(x-2)/(x+2)]×(x-2)/x=[(x+2)/(x-2)-(x-2)/(x+2)]×(x-2)/x={[(x+2)^2-(x-2)^2/[(x-2)(x+2)]}×(x-2)/x=8x/[(x-2)(x+2)]}×(x-2)/x=8/(x+2)=8/(2...