y=x^2+4 <span>
x+y=6
</span><span>y=x^2+4
</span>у= 6-х
х^2+4 = 6 - x
x^2 + x+4 - 6 = 0
x^2+x - 2 = 0
D= 1 +8= 9
x₁= -1+3/2 = 1
х₂= -1-3/2 =- 2
у₁= 5
у₂= 8
Ответ: (1;5) и (-2;8).
X - первый рабочий
Y -второй рабочий
5(x+y)=1
2y=1-7x
5x+5y=1
2y+7x=1 /*-2.5
5x+5y=1
-17.5x-5y=-2.5
-12.5x=-1.5
2y=1-7x
x=0.12
y=(1-7*0.12)/2
x=0.12
y=0.08
1)1/0.08= 12.5
<span>Ответ 12.5 часов</span>
1) (x - y)²
2) 2 * 5a * 7b
3) (x - 5)² = x² - 10x + 25
4) (4x⁵ + 7y³)² = (4x⁵)² + 2 * 4x⁵ * 7y³ + (7y³)² = 16x¹⁰ + 56x⁵y³ + 49y⁶
5) (y - 6)² - y(y - 8) = y² - 12y + 36 - y² + 8y = 36 - 4y
6) (2x + 1)² - 4x² = 7
4x² + 4x + 1 - 4x² = 7
4x = 7 - 1
4x = 6
x = 1,5