(2x+1)/(x²+3)>0 (x-3)/x²<0 (x²+8)/(x+1)>0
问题描述:
(2x+1)/(x²+3)>0 (x-3)/x²<0 (x²+8)/(x+1)>0
求满足下列条件的X的取值范围
答
(2x+1)/(x²+3)>0
∵(x²+3)>0
∴2x+1>0
x>-1/2
(x-3)/x²<0
∵x²>0
∴x-3>0
x>3
(x²+8)/(x+1)>0
∵(x²+8)>0
∴x+1>0
x>-1