Odpowiedź:
Zad.1
a)2 x + 5 = 11
2x=6
x=3
b) 6x = −12
x=-2
c) 5x + 10 = 30
5x= 20
x=4
Zad. 2.
a) x + 11 = −12
x= -23
b) x :4 = 3 /*4
x=12
c) – 2x + 3 = 8
-2x= 5
x= -2,5
ZAD 3
x+8=15
x=15-8
x= 7
ZAD 4
2(x+5) + 2(x-1) =32
2x+10 +2x -2 =32
4x +8 =32
4x = 24
x=6
Jeden bok ma 5cm, drugi 11 cm