题目: 若(2,1)既在f(x)=mx+n的图象上,又在它反函数图象上,求m,n的值. 答案: ∵(2,1)既在f(x)=mx+n的图象上,又在它反函数图象上,∴f(1)=2f(2)=1,∴m+n=22m+n=1,∴m=-3n=7.
题型:选择题 291. I have no bench to ________, so I have to stand there ___________ TV for a while.A.sit on… watchB.sit on …watchingC.sit… watchingD.sit… Watch 查看答案