1. Suppose f is a function that satisfies the equation f (x+y) =f(x)+f(y)+x2y+xy2for all real numbers x and y . Suppose also that 
. Then f'(x)=_________ . （10%）
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1. Suppose f is a function that satisfies the equation f (x+y) =f(x)+f(y)+x2y+xy2for all real numbers x and y . Suppose also that . Then f'(x)=_________ . （10%）