第465题:选择
把 1x−2\dfrac{1}{x-2}x−21 ,1(x−2)(x+3)\dfrac{1}{(x-2)(x+3)}(x−2)(x+3)1 ,2(x+3)2\dfrac{2}{(x+3)^2}(x+3)22 通分的过程中,不正确的是( ).
A. 最简公分母是(x−2)(x+3)2(x-2)(x+3)^2(x−2)(x+3)2
B. 1x−2=(x+3)2(x−2)(x+3)2\dfrac{1}{x-2} = \dfrac{(x+3)^2}{(x-2)(x+3)^2}x−21=(x−2)(x+3)2(x+3)2
C. 1(x−2)(x+3)\dfrac{1}{(x-2)(x+3)}(x−2)(x+3)1 =x+3(x−2)(x+3)2= \dfrac{x+3}{(x-2)(x+3)^2}=(x−2)(x+3)2x+3
D. 2(x+3)2\dfrac{2}{(x+3)^2}(x+3)22 =2x−2(x−2)(x+3)2= \dfrac{2x-2}{(x-2)(x+3)^2}=(x−2)(x+3)22x−2