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Kena22653
@Kena22653
August 2022
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Решите уравнение. 4 не трогайте.
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copitane
№1
1)x = 2 - y
2)подставляем (далее п.) (2 - y) (2 - y) * y = -15
3)2y - y^2 = -15
4)y^2 - 2y - 15 = 0
5)y1 + y2 = 2 y1 * y2 = -15
y1=5 y2= -3
6)x1= 2-5 x2= 2- (-3)
x1= -3 x2= 5
Ответ: (-3;5); (5;-3)
№2
1)x = y - 2
2)п. (у - 2) (у - 2)*у - у = 10
3)у^2 - 3y - 10 = 0
y1 + y2 = 3 y1 * y2 = -10
y1 = 5 y2 = -2
4)x1 = 5 - 2 x2 = -2 -2
x1 = 3 x2 = -4
Ответ: (3;5); (-4;-2)
№3
1)y = 5 - x^2
2)п. (5-x^2) 6x^2 -5 + x^2 = 2
3)7x^2 = 7
4)x = 1
5)y = 5 - 1
y = 4
Ответ: 1;4
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Answers & Comments
1)x = 2 - y
2)подставляем (далее п.) (2 - y) (2 - y) * y = -15
3)2y - y^2 = -15
4)y^2 - 2y - 15 = 0
5)y1 + y2 = 2 y1 * y2 = -15
y1=5 y2= -3
6)x1= 2-5 x2= 2- (-3)
x1= -3 x2= 5
Ответ: (-3;5); (5;-3)
№2
1)x = y - 2
2)п. (у - 2) (у - 2)*у - у = 10
3)у^2 - 3y - 10 = 0
y1 + y2 = 3 y1 * y2 = -10
y1 = 5 y2 = -2
4)x1 = 5 - 2 x2 = -2 -2
x1 = 3 x2 = -4
Ответ: (3;5); (-4;-2)
№3
1)y = 5 - x^2
2)п. (5-x^2) 6x^2 -5 + x^2 = 2
3)7x^2 = 7
4)x = 1
5)y = 5 - 1
y = 4
Ответ: 1;4