f（x）是一次函数，满足2f（x+1）=2x+16，则f（x）=______．

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问题填空题

答案

设f（x）=kx+b

则2f（2x+1）=2[k（2x+1）+b]=4kx+b+2=2x+16

∴4k=2，b+2=16，k=

，b=14

∴f(x)=

x+14

故答案为：

x+14

单项选择题

How should you try to right a capsized small sailing vessel?（）

A.Position all personnel at the stern and rock the vessel upright

B.Position all personnel around the mast and lift the vessel upright

C.Lock the centerboard in the down position，stand on the centerboard，and pull on a shroud or a halyard

D.Put the centerboard in the up position and have all personnel haul in on the line attached to the mast

填空题

西安事变又称（）。