№ 1.
1)5а + 5b = 5(a + b)
2)7a - 7b = 7(a - b)
3)2.5x - 2.5y = 2.5(x - y)
4)1/3x + 1/3y = 1/3(x + y)
№ 2
1)16x - 8 = 8(2x - 1)
2)24a + 6 = 6(4a + 1)
3)18b + 9 = 9(2b + 1)
4)25c - 5 = 5(5c - 1)
5)16c - 24d = 8(2c - 3d)
6)21m + 28n = 7(3m + 4n)
№ 3
1)ab + a = a(b + 1)
2)mn - m = m(n - 1)
3)a^3b - b = b(a^3 - 1)
4)x^3y + y = y(x^3 + 1)
5)a^3b^3 - b = b(a^3b^2 - 1)
6)x^3y^2 + y = y(x^3y + 1)
7)a^3b^2 + b^2 = b^2(a^3 + 1)
8)x^3y^2 - y^2 = y^2(x^3 - 1)
9)a^3b^2 - ab^2 = ab^2(a^2 - 1)
10)x^3y^2 + xy^2 = xy^2(x^2 + 1)
№ 4
1)2ab - 4a = 2a(b - 2)
2)3xy + 6x = 3x(y + 2)
3)5mn^2 + 10m = 5m(n^2 + 2)
4)3x^2y - 15x^2 = 3x^2(y - 5)
5)27y^4 - 18y^2 = 9y^2(3y^2 - 2)
6)42p^3 + 14p^2 = 14p^2(3p + 1)
( 3x + 4 ) ( 3x - 4 ) - 4x ( 2x + 1 ) = 0
9x² - 16 - 8x² - 4x = 0
x² - 4x - 16 = 0
D = b² - 4ac = 16 + 64 = 80
x₁₂ = 4 ± √80 / 2
x₁ = 4 + 4√5 / 2 = 2 + 2√5
x₂ = 2 - 2√5
Ответ: 2 - 2√5 ; 2 + 2√5
Ты можешь прислать фото учебника?
<span>(x-3)(x+2)-(x-1)(x+1)=3x+7</span>