Odpowiedzi

2010-03-16T19:44:52+01:00
(X - znak mnożenia)
x - niewiadoma

a) x = (42 - 1/2 X 6 X 12) : (1/2 X 6)
x = 42 - 36 : 3
x = 6 : 3
x = 2

b) x = [44 - 2 X 1/2 X 4 - (2x - 4) X 1/2 X 2] : 4
x = (44 - 4 - 2x - 4) : 4
x = (36 - 2x) : 4
x = 9 - 0,5x |+ 0,5x
1,5x = 9 |: 1,5
x = 6

c) x = 28 : 2 - 2x - 8
x = 14 - 2x - 8 |+ 2x
3x = 14 - 8
3x = 6 |: 3
x = 2