№5. А(-3;4) В(1;-8) М(х,у)
М((-3+1)\2;(4-8)\2) М(-1;-2)
АМ(-1+3;-2-4)
АМ(2;-6) ->A)
№8-А)
№10.а*ь=х1*х2+у1*у2
а*ь=6+6=12 ->А)
№12.соsα=(х1*х2+у1*у2)\√(х1вквадрате*у1вквадрате)*√(х2вквадрате*у2вквадрате)=(-15-48)\√(25+144)*√9+16=-63\(13*5)=-63\65=>В)
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shuttershyДобавить свой ответ
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