400-600-1123
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答案：
E
f(a +
A=F(X)=X2
X=a+b f(a+b)=x2=x2+x2 不等
B=f(x)=x+1
X=a+b
F(a+b)=a+b+1
F(a)+f(b)=a+b+1+a+b+1 不等
C=F(a+b)=sqrt(a+b)
F(a)+f(b)=sqrta+sqrtb 不等
D跟C同理
E=-3(a+b)=-3a-3b
F(a)+f(b)=-3a+(-3b) 相等
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