Question

1,2 помогите. 20 баллов

Answer 1

1)
раз М - середина АВ

$x_M= frac{1}{2} (x_A+x_B) \ y_M= frac{1}{2} (y_A+y_B) \ x_M = 2 \y_M =1 \ x_B =5 \ y_B = 0\ (x_A) = 2x_M - x_B = \ = 2 times 2 - 5 = - 1\ (y_A) = 2y_M - y_B = \ = 2 times 1 - 0 = 2$
Ответ :
A(-1; 2)

2)

$x_E=-2 \ y_E=3 \ x_F=1 \ y_F=2 \ \ x_{EF}= x_F - x_E = \ = 1 - ( - 2) = 3\ y_{EF}=y_F - y_E = \ = 2 - 3 = - 1$

$|EF| = sqrt{ {x_{EF}}^{2} + y_{EF}^{2} } = \ = sqrt{ {3}^{2} + {( - 1)}^{2} } = sqrt{10}$