Ex. 1
a) 20÷2=10
b)20÷4×2=10
c)20÷5×3=12
d)20÷10=2
Ex.2
aflam cati sa vndut in total dimineata si la amiaza
[tex] \frac{2}{6} ^{5} + \frac{2}{5} ^{6} = \frac{10}{30} + \frac{12}{30} = \frac{22}{30} [/tex]
300 l ÷30×22=220 litri sau vandut dimineata si la amiaza
Calculam cati litri sau vandut seara:
300-220=80 l
Raspuns: 80 l
Ex.3
aflam cati elevi au primit premii si mentiuni:
[tex] \frac{1}{10} ^{6} + \frac{1}{6} ^{10} + \frac{1}{4} ^{15} = \frac{6}{60}+ \frac{10}{60} + \frac{15}{60} [/tex]=[tex] \frac{31}{60} [/tex]
60÷60×31=31-elevi au primit premii
60-31=29-elevi ce nu au primit nimic
