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数学
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若对一切实数x,y,都有f(x+y)=f(x)=f(y).(1)求f(0),并证明f(x)为奇函数;(2)若f(1)=3,求f(-3).
人气:376 ℃ 时间:2019-10-19 19:20:23
解答
题目应该是f(x+y)=f(x)+f(y)吧
1、令x=y=0,则f(0)=0
2、令x=-y,则f(x)+f(-y)=f(0),f(x)=f(-y)
3、f(2)=f(1)+f(1)=6
f(3)=f(1)+f(2)=9
f(-3)=-f(3)=-9
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