Toán Lớp 7: Cho hàm số y=f(x)=3x/2. Tính f(2);f(-1);f(3);f(-3);f(4);f(-4);f(5);f(-5)

Question

Toán Lớp 7:  Cho hàm số y=f(x)=3x/2. Tính f(2);f(-1);f(3);f(-3);f(4);f(-4);f(5);f(-5)

ngocle44 · Answer

Ta c&oacute;: f(2)=3.2/2=3   f(-1)= $ dfrac{3.(-1)}{2}$=$ dfrac{-3}{2}$     f(3)=3.3/2=9/2     f(-3)=$ dfrac{3.(-3)}{2}$=$ dfrac{-9}{2}$     f(4)=3.4/2=12/2=6     f(-4)=$ dfrac{3.(-4)}{2}$=$ dfrac{-12}{2}$=-6     f(5)=3.5/2=15/2     f(-5)=$ dfrac{3.(-5)}{2}$=$ dfrac{-15}{2}$

lanngocha · Answer

~ Bạn tham khảo ~    Thay x=2 ta c&oacute; :   f(2) = [3*2]/2 = 3   Thay x=-1 ta c&oacute; :   f(-1) = [3*(-1)]/2 = -3/2   Thay x=3 ta c&oacute; :   f(3) = [3*3]/2 = 9/2   Thay x=-3 ta c&oacute; :   f(-3) = [3*(-3)]/2 = -9/2   Thay x=4 ta c&oacute; :   f(4) = [3*4]/2 = 6   Thay x=-4 ta c&oacute; :   f(-4) = [3*(-4)]/2 = -6   Thay x=5 ta c&oacute; :   f(5) = [3*5]/2 = 15/2   Thay x=-5 ta c&oacute; :   f(-5) = [3*(-5)]/2 = -15/2