2.
1) 25x⁶ - 15x³y=5x³(5x³ - 3y)
2) 2a(a-1)+3(a-1)=(a-1)(2a+3)
3.
(15a-10b)/(200b-300a)= - 5(3a-2b)/100(3a-2b)= - 5/100 = - 0.05
4.
18x-6x²=0
6x(3-x)=0
6x=0 3-x=0
x=0 x=3
Ответ: 0; 3.
5.
(4x² + ... - 7) - (... + x - ...)=x²+2x+1
4x² - ...=x²
... =4x²-x²
... =3x²
... - x =2x
... =2x+x
... =3x
-7 + ... = 1
... = 1+7
... = 8
(4x² + 3x - 7) - (3x² + x - 8)=x²+2x+1