Răspuns:
21:3-4 =7-4=3
81:9+48 =9+48=57
28+ 64:8= 28+8=36
28:7+14=4+14=28
90-46:5=90-9=81
5×7-28=35-28=7
4×9+3×5=36+15=51
7×9-36=63-36=27
18:6×4+27=3×4+27=12+27=39
8+10:(66-56)=(8+10):(58-56)
8+10:10 =18:2
8+1 =9
9
(3×4):2+2=12:2+2=6+2=8
3×(4:2)+2=3×2+2=6+2=8
ți-am răspuns si la ex de la comentarii