设f(x)满足关系式f(x)+2f(-x)=3x,则f(x)=

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设f(x)满足关系式f(x)+2f(-x)=3x,则f(x)=设f(x)满足关系式f(x)+2f(-x)=3x,则f(x)=设f(x)满足关系式f(x)+2f(-x)=3x,则f(x)=令X=-X,带

设f(x)满足关系式f(x)+2f(-x)=3x,则f(x)=
设f(x)满足关系式f(x)+2f(-x)=3x,则f(x)=

设f(x)满足关系式f(x)+2f(-x)=3x,则f(x)=
令X=-X,带入可得2个等式,消掉f(-X)即可
-3X

f(x)是偶函数?或者和f(-x)有什么关系吗?

f(-x)+2f(x)=-3x;
2f(-x)+4f(x)=-6x;
3f(x)=-9x;
f(x)=-3x;