a) 7-5+1=3
b) 2-13= - 11
c) 10 x 0,5 + 12 = 5+12=17
d) 3x4 - 6 = 12-6=6
Zadanie 2
[tex]pole \: kwadratu \\ p = {a}^{2} [/tex]
[tex] {a}^{2} = 144 [/tex]
[tex]a = \sqrt{144} [/tex]
[tex]a = 12[/tex]
[tex]obw = 4 \times 12 = 48cm[/tex]
