已知函数f(x)=x+2,x<=0,-x+2,x>0,则不等式f(x)>=x&sup2;的解集是

2024-12-20 08:34:13
推荐回答(1个)
回答1:

x<=0
则x+2>=x²
x²-x-2<=0
(x+1)(x-2)<=0
-1<=x<=2
所以-1<=x<=0

x>0
则-x+2>=x²
x²+x-2=(x+2)(x-1)<=0
-2<=x<=1
所以0
所以-1<=x<=1