1) 2(3x + 1) - x ≤ 3(x + 4), 2) 7x + 4(x - 2) > 6(1 + 3x),
6х + 2 - х ≤ 3х + 12, 7х + 4х - 8 > 6 + 18x,
5х + 2 ≤ 3х + 12, 11x - 8 > 6 + 18x,
5х - 3х ≤ 12 - 2, 11x - 18x > 6 + 8,
2х ≤ 10, -7x > 14,
х ≤ 5, x < - 2,
х ∈ (-∞; 5]; x ∈ (-∞; -2);
3) 2(x - 1) - 3(x + 2) < 6(1 + x), 4) 7(y + 3) - 2(y + 2) ≥ 2(5y + 1),
2x - 2 - 3x - 6 < 6 + 6x, 7y + 21 - 2y - 4 ≥ 10y + 2,
-x - 8 < 6 + 6x, 5y + 17 ≥ 10y + 2,
-x - 6x < 6 + 8, 5y - 10y ≥ 2 - 17,
-7x < 14, -5y ≥ -15,
x > -2, y ≤ 3,
x ∈ (-2; +∞); y ∈ (-∞; 3].
Пошаговое объяснение:
7 * 7 + 5 * 3 = 64
7 * 7 + 6 * 4 = 73
7 * 7 + 7 * 0 = 49
7 * 7 + 9 * 2 = 67
7 * 7 - 5 * 3 = 34
7 * 7 - 6 * 4 = 25
7 * 7 - 7 * 0 = 49
7 * 7 - 9 * 2 = 31
8 * 7 + 5 * 3 = 71
8 * 7 + 6 * 4 = 80
8 * 7 + 7 * 0 = 56
8 * 7 + 9 * 2 = 74
8 * 7 - 5 * 3 = 41
8 * 7 - 6 * 4 = 32
8 * 7 - 7 * 0 = 56
8 * 7 - 9 * 2 = 38
7 * 9 + 5 * 3 = 78
7 * 9 + 6 * 4 = 87
7 * 9 + 7 * 0 = 63
7 * 9 + 9 * 2 = 81
7 * 9 - 5 * 3 = 48
7 * 9 - 6 * 4 = 39
7 * 9 - 7 * 0 = 63
7 * 9 - 9 * 2 = 45
6 * 7 + 5 * 3 = 57
6 * 7 + 6 * 4 = 66
6 * 7 + 7 * 0 = 42
6 * 7 + 9 * 2 = 60
6 * 7 - 5 * 3 = 27
6 * 7 - 6 * 4 = 18
6 * 7 - 7 * 0 = 42
6 * 7 - 9 * 2 = 24
Можно как лучшее? :D :D :D
S=4*4:4=4cm2
ответ:S=4cm2
Пошаговое объяснение: