<u>2x^2 + y^2 = 2xy + 4x</u>
<span>2x^2 + y^2 - 2xy = 4x</span>
(x - y)^2 = 4x - x^2
(x - y)^2 = x(4 -x)
x - y = 0 4 - x = 0
y =4 x = 4 (x;y) = (4;4)
x - y = √ x(4 -x)
x(4 -x) = x^2
4 - x = x
2x = 4
x=2
2*<span>2^2 + y^2 - 2*</span><span>2y = 4*</span>2
8 + <span>y^2 -4y = 8</span>
y(y-4) = 0
y =4 (x;y) = (2;4)
<span>1) 7/12x-0,5=1,25
7/12 х=1,25+0,5
7/12х=1,75
х=1,75: 7/12 = 1 75/100 :7/12= 1 3/4:7/12
х=3
2) 2,7 + 2/9y = 4,3
2/9у=4,3-2,7
2/9у=1,6
у= 1,6:2/9= 1 6/10:2/9=66/10:2/9=29 7/10
у=29,7
</span>
735см+490см+155см=1380см=13м8дм