Odpowiedź:
7a- 1/2a= 56-4= 54
3b2+2b = 3• 16+8= 56
a) 7a - [tex]\frac{1}{2}a[/tex] = (7 × 8) - ([tex]\frac{1}{2}[/tex] × 8) = 56 - 4 = 52
b) 3b² + 2b = 3 × (-4)² + 2 × (-4) = 3 × 16 + (-8) = 48 - 8 = 40
