f(1/2)=2*1/2-3=-2
y=f(x)=2x -3
Suy ra 2x-3=-5
2x= -5+3
2x=-2
Vậy x= -1
Trả lời ;...................................
x = -1.........................................
Hk tốt.......................................
a) Ta có: \(f\left(\frac{1}{2}\right)=2.\frac{1}{2}-3=1-3=-2\)
b) Ta có: \(y=f\left(x\right)=2x-3\)
mà \(y=-5\)\(\Rightarrow2x-3=-5\)
\(\Rightarrow2x=-2\)\(\Rightarrow x=-1\)
Vậy x = -1