Then according to the distance formula between two points,
①x^2+y^2= 1
②(x- 1)^2+(y-2)^2=4
To solve it, substitute ① into ②.
X=-3/5，y=4/5。
So D(-3/5, 4/5)
The solution is as follows
According to the topic, we can establish the following inequality: 80× x
Using the mathematical equation, we can express it as: 80x.
Now