1) ordinea efectuarii operatiilor
(25+10):5=35:5=7
(28-8):4=20:4=5
(25+10):5=25:5+10:5=5+2=7
(28-8):4=28:4-8:4=7-2=5
2 a. (14+35):7=14÷7+35:7=2+5=7
=49:7=7
(40+16)/8=40/8+16/8=5+2=7
sau 56/8=7
b. (30-18)/6=12/6=2
30/6-18/6=5-3=2
(63-27)/9=63/9-27/9=7-3=4
sau 36/9=4
(15+9+6)/3=30/3=10
15/3+9/3+6/3=5+3+2=10
(16-8+4)/2=12/2=6
16/2-8/2+4/2=8-4+2=6
3) 25 kg +15 kg =40 kg
40 kg / 5 kg = 8 pungi
