已知定义域在R上的函数f(x)满足f(x+y)=f(x)+f(y),且x>0时,f(x)>0 解不等式f(a^2-4)+
3个回答
f(a^2-4)+f(2a+1)<0
f(a^2-4+2a+1)<0
x>0时,f(x)>0
因此a^2-4+2a+1<0
(a-1)(a+3)<0
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1年前
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