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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 7: Cho hàm số y=f(x) =2x+3.Ta có: A.f(0)=5 B.f(1)=7 C.f(-1)=1 D.f(-2)=1

Toán Lớp 7: Cho hàm số y=f(x) =2x+3.Ta có:
A.f(0)=5
B.f(1)=7
C.f(-1)=1
D.f(-2)=1

Comments ( 2 )

  1. Ta có: f(-1)=2.(-1)+3=-2+3=1

    Vậy ta chọn ý C

     

  2. y=f(x)= 2x+3

    A.f(0)= 2.0+3

    = 0+3

    = 3

    B. f(1)= 2.1+3

    = 2+3

    = 5

    C.f(-1)= 2.(-1)+3

    = -2+3

    = 1

    D.f(-2)= 2.(-2)+3

    = -4+3

    = -1

    => C

    #Jo

     

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222-9+11+12:2*14+14 = ? ( )