exercitiile 11, 12, 13,14,15,16

Răspuns:
11. 16:4=4
24+4=28
98-28=70.
12. 36:4=9
13. 28:4=7
50+7=57
98-50=48
14. x:2+90=100
x:2=100-90=10
x=10×2=20
proba: 20:2+90=
10+90=100
15. 8×9=72
24:4=6
6×6=36
72-36=36
16. 6×7=42
40:4=10
10-10=0
42+0=42