(1)3/(2x+1) x≠1/2 (2)1/备宏x x≠0(3)芹中2/(x^2+1)仿首册x为任意实数(4)x/(3x+3) x≠-1 (5)2/(x^2-4) x≠±2
1,x<>空兄-1/2;2,x<>03,x<>高高i4,x<>-15,x<>斗念袭2或-2
x≠-1/2x≠0x是任意实数x≠-1x≠2且x≠-2