Odpowiedź:
zad 3
a)
- (2x - 1) = 4
- 2x + 1 = 4
- 2x = 4 - 1 = 3
2x = - 3
x = - 3/2 = - 1 1/2 = - 1,5
b)
2(x + 1) = x
2x+ 2 = x
2x- x = - 2
x = - 2
c)
2t - (3t + 1 ) = 6
2t - 3t - 1 = 6
- t = 6 + 1
- t = 7
t = - 7
d)
- (4 + x) = 2(3 - x)
- 4 - x = 6 - 2x
- x + 2x = 6 + 4
x = 10
e)
3(y + 6) - y = 2(y + 9)
3y + 18 - y = 2y + 18
2y - 2y = 18 - 18
0 = 0
Równanie tożsamościowe , y ∈ R
f)
x - 7 - 2(3x + 5) = 3
x- 7 - 6x - 10 = 3
- 5x - 17 = 3
- 5x = 3 + 17 = 20
5x = - 20
x = - 20/5 = - 4
