设f(x)=4x4x+2,则f(1/11)+f(2/11)+f(3/11)+…+f(10/11)=_.
问题描述:
设f(x)=
,则f(4x
4x+2
)+f(1 11
)+f(2 11
)+…+f(3 11
)=______. 10 11
答
令α+β=1,则α=1-β
f(α)+f(β)=
+4α
4α+2
=4β
4β+2
+41−β
41−β+2
=4β
4β+2
+4 4+2×4β
=12×4β
2×4β+4
即两自变量的和为1时,函数值的和也是1
∴f(
)+f(1 11
)+f(2 11
)+…+f(3 11
)=510 11
故答案为5