1. -8+(-12):(-3)=-8+4=-4
2. 12=2^2×3
18=2×3^2
[12;18]=2^2×3^2=4×9=36
3. 6kg............21 lei
11kg.........x lei
6x=11×21
6x=231
x=231:6
x=38,5 lei
1. ab=3×5. 14-ab=14-15=-1
ab=15
b) -1(cel corect)
2. a)90 de grade(cel corect)
3. x- numar elevi
25%x=7
25x/100=7
x/4=7
x=4×7
x=28
28-7=21 fete
c)21(răspunsul corect)
