已知f(x)=x2-3x+2,求:f(0),f(1),f(2),f(-x),(x≠0),f(x+1)
已知函数f(x)=1og3(x+1)+log3(5-x),则f(x)的()
A.最大值为3
B.最大值为9
C.最大值为2
D.最小值为2
A.Dim text As String
B.If f Then x=x*x+1
C.s="cd"+3
D.s=Mid("abc123",3)
A.x=30, y=50, z=80
B.x=50, y=80, z=80
C.x=80, y=30, z=50
D.x=50, y=30, z=30