решите систему уравнений 1) x^2-xy+y^2=7; x+y=5 2)x^2-y=14; 3x+y=4; 3)x^2+y^2=17; y-3x-1=0. Created by Aselisssa. matematika-ru

решите систему уравнений 1) x^2-xy+y^2=7; x+y=5 2)x^2-y=14; 3x+y=4; 3)x^2+y^2=17...

July 2022 1 5 Report

решите систему уравнений 1) x^2-xy+y^2=7; x+y=5 2)x^2-y=14; 3x+y=4; 3)x^2+y^2=17; y-3x-1=0

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sidelnikovarim Решим системы способом подстановки
1) x^2-x(5-x)+(5-x)^2-7=0 x^2-5x+x^2+25-10x+x^2-7=0 3x^2-15x+18=0
y=5-x y=5-x y=5-x

x^2-5x=6=0 x1=2 x2=3
y-5-x y1=3 y2=2 отв. (2;3) и (3;2)

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