1.
a)-3x(2x-1) = -6x^2 + 3x
б)(2a-b)8b + 8b^2 = 16ab - 8b^2 + 8b^2 = 16ab
2.
a)3ax+4a = a(3x+4)
б)6x^2 - 3x = 3x(2-1)
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Вот))))))))))))))))))))))
X²-6x-8y+y²=0
(x²-6x)+(y²-8y)=0
(x²-2x*3+3²)+(y²-2y*4+4²)-3²-4²=0
(x-3)²+(y-4)²-9-16=0
(x-3)²+(y-4)²=25 - уравнение окружности
(x-3)²+(y-4)²=5²
S(3;4) - координаты центра
R=5 - радиус окружности