1){x-y=5 {x^2+5x=0 2){x^2+y^2=26 {x-y=-4 3){x+y=7 - вопрос №90166081525022226437230 от 89051330939 21.12.2020 19:16

Question

Алгебра: 1){x-y=5 {x^2+5x=0 2){x^2+y^2=26 {x-y=-4 3){x+y=7 {y^2-3y=0 напишите только решение без слов

89051330939 · Answer

1) {x - y = 5, x^2 + 5x = 0}x(x +5) = 0x = 0, y = -5x = -5, y = -102) {x^2 + y^2 = 26, x - y = -4}y = x + 4x^2 + (x+4)^2 = 262x^2 + 8x + 16 = 26x^2 + 4x - 5 = 0x = -5, y = -1x = 1, y = 53) {x+y = 7, y^2 - 3y = 0}y(y-3) = 0y = 0, x = 7y = 3, x = 4...