已知函数f(x)满足f(x+y)=f(x)+f(y)+xy(x+y),又f'(0)=1,则函数f(x)的解析式为
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已知函数f(x)满足f(x+y)=f(x)+f(y)+xy(x+y),又f''(0)=1,则函数f(x)的解析式为已知函数f(x)满足f(x+y)=f(x)+f(y)+xy(x+y),又f''(0)=1,
已知函数f(x)满足f(x+y)=f(x)+f(y)+xy(x+y),又f'(0)=1,则函数f(x)的解析式为
已知函数f(x)满足f(x+y)=f(x)+f(y)+xy(x+y),又f'(0)=1,则函数f(x)的解析式为
已知函数f(x)满足f(x+y)=f(x)+f(y)+xy(x+y),又f'(0)=1,则函数f(x)的解析式为
x=y=0 f(0)=f(0)+f(0)+0 f(0)=0
f(x+y)-f(x)=f(y)+xy(x+y)
f'(x)=lim y->0 [f(x+y)-f(x)]/y=lim [f(y)/y+x(x+y)]=f'(0)+x^2=1+x^2
因此f(x)=积分[1+x^2]dx=x+x^3/3+C
又f(0)=0 得C=0
因此 f(x)=x+x^3/3
,一切x,y都满足等式,还是x,y可以随意取啊这个用特值法啊。因为对一切实数都满足啊,所以假设x=y=0,代入得到2f(0) = f(0),即f(0)=0;
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