问题
填空题
已知f(x-
|
答案
因为f(x-
)=x2+2x-1 x
+2 x
=(x2+1 x2
)+(2x-1 x2
)=(x-2 x
)2 +2(x-1 x
)+21 x
所以f（x）=x2+2x+2．
故答案为：x2+2x+2．
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已知f(x-
|
因为f(x-
)=x2+2x-1 x
+2 x
=(x2+1 x2
)+(2x-1 x2
)=(x-2 x
)2 +2(x-1 x
)+21 x
所以f（x）=x2+2x+2．
故答案为：x2+2x+2．