a) (5+10):2=7,5
b) (10+15+30):3=18,(3)
c) (12+15+22+25):4=74:4=18,5
d) (6+7+8+9+10):5=40:5=8
ma=a+b/2(in functie de cate numere sunt sus acel numar il pui jos)
5+10totul supra 2=15/2=15:2=7.5
10+15+30/3=55÷3=18.(3)
12+15+22+25/4=34+40/4=72/4=18
6+7+8+9+10/5=40/5=40÷5=8
sper ca te-am ajutat