1)6x(x-y)-8(x-y)=(6x-8)(x-y)
2)a(a-b)-5(a-b)=(a-5)(a-b)
3)b(b+c)+a(b+c)=(b+a)(b+c)
4)xy(3-(x^2)*(y^2))-2(3-(x^2)*(y^2))=(xy-2)*(3-(x^2)(y^2)
1)
а) 1 2/5 - 1/4 = 7/5 - 1/4 = 28/20 - 5/20 = 23/20 = 1,15 - Ответ: 3)
б) 16 : 40 = 0,4 - Ответ: 1)
в) 3 4/5 - 2 1/4 = 19/5 - 9/4 = 76/20 - 45/20 = 31/20 = 1,55 - Ответ: 2)
2)
x⁻⁷/x¹⁰*x⁻² = x⁻⁷/x⁸ = 1/x = x⁻¹
3)
(x + 8)² = (x + 3)²
x² + 16x + 64 = x² + 6x + 9
10x = 9 - 64
10x = -55
x = -5.5
|х-4| = 6, т.е. |х| = 10, -10.
|х-7|: -(х-7) = -х+7 = -10+7 = -3, х-7 = 10-7 = 3.
Корень(х+3)=1
возводим в квадрат
х+3=1
Х=–2