已知函数f(x)满足2f(x)+f(-x)=5x+4求f（x）和f（-x）

网友回答

2f(x)+f(-x)=5x+4 (1)
令x=-x2f(-x)+f(x)=-5x+4 (2)
(2)×2-(1)
3f(-x)=-10x+8-5x-4=-15x+4
所以f(-x)=(4-15x)/3
======以下答案可供参考======
供参考答案1:
√0.5436
=√(54.36/100)
=√54.36÷10
=0.7373
√54360
=√(5.436×10000)
=100×√5.436
=233.1
1350131435415310350