- 512\343 или -1 целая 169\343
Формулы: a^2+2ab+b^2=(a+b)^2; a^2-2ab+b^2=(a-b)^2
1)(10m-5)^2
2) (3m-1)^2
3) 29(2x-y)
4) (5a+7)^2
5) (4-ab)^2
9). (5^n - 5^(n-1))/5^(n-2) = (5^n/5^(n-2)) - (5^(n-1)/5^(n-2)) =
= 5^(n-n+2) - 5^(n-1-n+2) = 5² - 5 = 20
8). (b-c)/b - (c²/(b²-bc)) + 2b/(b-c) = (b-c)/b - (c²/b(b-c)) + 2b/(b-c) =
= ((b-c)² - c² + 2b²)/(b(b-c)) =
= (b²-2bc+c²-c²+2b²)/(b(b-c))=
= (3b²-2bc)/(b(b-c) = (b(3b-2c))/(b(b-c) =
= (3b-2c)/(b-c) = (3b-3c)/(b-c) + c/(b-c) =
= 3 + c/(b-c)
Y=-4x+m
K(2;-10) ⇒ х=2 у=-10
<em>подставим в уравнение прямой</em>
-10=-4*2+m
-10=-8+m
m=-2