Question

rezolvă exercițiile:
1) 2×9-3×5+16:4=
2) 3×8+4×6-6×7+1=
3)2×50-9×9-6×3+2=
4)8:2×6-49:7×3=
5)3×15×4-11×5=
6)200:2:2:5=
7)23×15×3-21×3×7=

Answer 1

1) 2*9-3*5+16:4=
18-15+4=3+4=7

2.) 3*8+4*6-6*7+1=
24+24-42+1=
48-42+1= 6+1=7

3.) 2*50-9*9-6*3+2=
100-81-18+2=1+2=3

4.) 8:2*6-49:7*3=
4*6-7*3= 24-21=3

5.) 3*15*4-11*5=
180-55=125

6.) 200:2:2:5= 100:2:5=10

7.) 23*15*3-21*3*7=
1035-441=594

Answer 2

1) 2 × 9 - 3 × 5 + 16 : 4 = 18 - 15 + 4 = 3 + 4 = 7

2) 3 × 8 + 4 × 6 - 6 × 7 + 1 = 24 + 24 - 42 + 1 = 48 - 42 + 1 = 6 + 1 = 7

3) 2 × 50 - 9 × 9 - 6 × 3 + 2 = 100 - 81 - 18 + 2 = 19 - 18 + 2 = 1 + 2 = 3

4) 8 : 2 × 6 - 49 : 7 × 3 = 4 × 6 - 7 × 3 = 24 - 21 = 3

5) 3 × 15 × 4 - 11 × 5 = 3 × 60 - 55 = 180 - 55 = 125

→ am folosit asociativitatea inmultirii: asociind al doilea cu al treilea factor

6) 200 : 2 : 2 : 5 = 100 : 2 : 5 = 50 : 5 = 10

7 ) 23 × 15 × 3 - 21 × 3 × 7 = 345 × 3 - 147 × 3 = 1 035 - 441 = 594