问题:
设二次函数f(x)=x 2+2x+3,x 1,x 2∈R,x 1≠x 2,且f(x 1)=f(x 2),则f(x 1+x 2)=( )
A.1
B.2
C.3
D.4
设二次函数f(x)=x 2+2x+3,x 1,x 2∈R,x 1≠x 2,且f(x 1)=f(x 2),则f(x 1+x 2)=( )
A.1 | B.2 | C.3 | D.4 |
参考答案: