Question

Cho hàm số y = f (x) =-1/2 x .Tính f(1);f(-5) ; f(-3/2)

Answer 1

\(f\left(1\right)=-\dfrac{1}{2}\\ f\left(2\right)=-\dfrac{1}{2}\left(-5\right)=\dfrac{5}{2}\\ f\left(-\dfrac{3}{2}\right)=-\dfrac{1}{2}\left(-\dfrac{3}{2}\right)=\dfrac{3}{4}\)

Answer 2

\(\left\{{}\begin{matrix}f\left(1\right)=-\dfrac{1}{2}.1=-\dfrac{1}{2}\\f\left(-5\right)=-\dfrac{1}{2}.\left(-5\right)=\dfrac{5}{2}\\f\left(-\dfrac{3}{2}\right)=\left(-\dfrac{1}{2}\right).\left(-\dfrac{3}{2}\right)=\dfrac{3}{4}\end{matrix}\right.\)

Answer 3

f(1)=−12+1-12+1
=-1+1
=0
f(2)=−22+1-22+1
=-4+1
= -3
f(3/2)=−(32)2+1-(32)2+1
= -2,25+1
= -1,25
​f(-2)=−(−2)2+1-(-2)2+1
=-4 +1 
=-3