Пошаговое объяснение:
№1
1)
(x + 8)\3 - (x-2)\5 = 2
5(x+8) - 3(x-2) = 30
5x + 40 - 3x +6 = 30
2x = 30 - 46
2x = -16
x = -8
2)
(18 - 3x) - (4 +2x) = 10
18 - 3x - 4 - 2x = 10
18 - 4 - 10 = 5x
4 = 5x
x = 0.8
№2
1)-30 a^10 b^7; 2)-216 m^9 n^6
№3
a)(6^15 * 6^11) / 6^24 = 6^26 / 6^24 = 6^2 = 36
б)(3^11 * 27) / 9^6 = (3^11 * 3^3) / (3^2)^6 = 3^14 / 3^12 = 3^2 = 9
№5
a)(3a + 4)^2 = 9a^2 + 24a + 16;
б)(2x - b)^2 = 4x^2 - 4xb + b^2
c)(b+3)(b-3) = b^2 - 9
№6
(4x + 12y = 120, - типа система
(3x + 20y = 167;
x + 3y = 30 --> x = 30 - 3y
3(30 - 3y) + 20y = 167
90 - 9y + 20y = 167
11y = 77
y = 7, тогда x = 30 - 3*7 = 9