问题
填空题
设函数f(x)=x
|
答案
∵f(x)=x
(x≥-2),x+2
g(x)=
(x≥-2);x+2
∴F(x)=f(x)•g(x)
=(x
)•x+2 x+2
=x(x+2)
=x2+2x(x≥-2);
故答案为:x2+2x(x≥-2).
设函数f(x)=x
|
∵f(x)=x
(x≥-2),x+2
g(x)=
(x≥-2);x+2
∴F(x)=f(x)•g(x)
=(x
)•x+2 x+2
=x(x+2)
=x2+2x(x≥-2);
故答案为:x2+2x(x≥-2).