<span>у=7х-10/6
-11+5/3=7x
22/3=7x x=22/21
</span>
1) (Х+4)^2= х^2+8х+16; 2) (3b-c)^2= 9b^2-6bc+c^2; 3) (2y+5)((2y-5)= 4 y^2-25
Значение многочлена на фотографии
2x - y = 4
x + y = 5
-----------------
2x + x = 4 + 5
3x = 9
x = 3
y = 5 - x = 5 - 3 = 2
Ответ:
(3; 2)