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2(-3) + 5
-6+5=-1
b) 2×(-0.5)+ 5
-1+5=4
zad 2
a) 5×(0.5)² - ⅓
5×0.25 - ⅓
1¼- ⅓= 15/12-4/12= 11/12
b) 5×(-¼)² - ⅕
5×1/16- ⅕
5/16- ⅕
25/80- 16/80= 9/80
c) 5×(-2)² - 20
5×4-20= 20-20=0