х=(-4+(-1)):2=-5:2=-2,5
у=(-5+(-5)):2=-10:2=-5
С(-2,5;-5)
[tex] \sqrt{ { (- 4 - ( - 1))}^{2} + {( - 5 - ( - 5))}^{2} } = \sqrt{ {( - 3)}^{2} + {0}^{2} } = \sqrt{9} = 3[/tex]
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х=(-4+(-1)):2=-5:2=-2,5
у=(-5+(-5)):2=-10:2=-5
С(-2,5;-5)
[tex] \sqrt{ { (- 4 - ( - 1))}^{2} + {( - 5 - ( - 5))}^{2} } = \sqrt{ {( - 3)}^{2} + {0}^{2} } = \sqrt{9} = 3[/tex]