ex.5
a) 7×8+6×7-3×7= 56+42-21= 98-21= 77
9+5×6-25:5= 9+30-5= 39-5= 34
b) 7×6-12+7×10= 42-12+70= 30+70= 100
15-15:3+2×5×5= 15-5+10×5= 10+50= 60
c) 400+5×8+72÷9-48= 400+40+8-48= 448-48= 400
300-64:8+6×6-28= 300-8+36-28= 292+36-28= 328-28= 300
ex. 7
a) 2:2+2×2-2= 1+4-0= 5
3+3×3+3÷3-3= 3+9+1-3= 12+1-3= 13-3= 10
4×4-4÷4+4= 16-1+4= 15-4= 11
b) 5-5÷5+5×5= 5-1+25= 4+25= 29
6:6+6×6-6= 1+36-6= 37-6= 31
7-7÷7+7×7= 7-1+49= 6+49= 55
c) 8-8:8+8×8= 8-1+64= 7+64= 71
9÷9+9×9-9= 1+81-9= 82-9= 72
10-10÷10+10×10= 10-1+100= 9+100= 109
sper ca te am ajutat!
(÷ inseamna împărțit)
