Toán Lớp 9: Cho hàm số y=f(x)=x+3. Tính f(-1); f(-2); f(1/ 2); f(1/2);f(– 2/3)
Leave a reply
Register Now
Login
Lost Password
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Toán Lớp 9: Cho hàm số y=f(x)=x+3. Tính f(-1); f(-2); f(1/ 2); f(1/2);f(– 2/3)
Comments ( 1 )
Giải đáp:
$\begin{array}{l}
y = f\left( x \right) = x + 3\\
+ f\left( { – 1} \right) = – 1 + 3 = 2\\
+ f\left( { – 2} \right) = – 2 + 3 = 1\\
+ f\left( {\dfrac{1}{2}} \right) = \dfrac{1}{2} + 3 = \dfrac{7}{2}\\
+ f\left( { – \dfrac{1}{2}} \right) = – \dfrac{1}{2} + 3 = \dfrac{5}{2}\\
+ f\left( { – \dfrac{2}{3}} \right) = – \dfrac{2}{3} + 3 = \dfrac{{ – 2 + 9}}{3} = \dfrac{7}{3}
\end{array}$