Odpowiedź:2kg,90°
Zad.1.
x - waga cegły
2x = 1,5x + 1
2x - 1,5x = 1
0,5x = 1
5x = 10
x = 2kg
Zad.2.
x + 8x + 40 + 3x + 50 + 7x - 15 = 360
x + 8x + 3x + 7x = 360-40-50+15
19x = 285/÷19
x = 15°
8x + 40 =8×15 + 40 = 120 + 40 = 160°
3x + 50 = 3 × 15 + 50 = 45 + 50 = 95°
7x - 15 = 7×15 - 15 = 105-15= 90°