0000/0001/0010/0011/0100/0101/0110/0111/1000/1001/1010/1011/1100/1101/1110/1111
16 способов.
4^2
5. а) 3(x+4) = 5
3x + 12 = 5
3x = -7
x = -7/3
б) 5(x-2) = -20(x+1)
5x - 10 = -20x - 20
25x = -10
x = -2/5
6. а) x + 5 = 30
x = 25
b) x+12 = -3x
4x = -12
x = -3
c) 2(x-1) + 5 - x = 3
2x - 2 + 5 - x = 3
x + 3 = 3
x = 0
12×20=240
15×15=225
225+240=465
Ответ:465 деталей.