1 .
[840:(160-1000:8)+24]x5=
[840 : (160 - 125)+24]×5=
(840:35+24)×5=
(24+24)×5=
48×5=
240
{8 500-[200+(999:3+14x2)x10]:5+15}x2=
{8 500-[200+(333+28)x10]:5+15}x2=
[8 500-(200+361x10):5+15]x2=
[8 500-(200+3 610):5+15]x2=
(8 500-3 810:5+15)x2=
(8 500-762+15)x2=
(7 738 + 15 ) ×2 =
7 753 × 2 =
15 506
(3 600+1 400):10:5+(160-90:3)=
5 000 :10:5+(160-30)=
500:5+130=
100+130=
230
(825+124x5):5+(168x3+195x14):3=
(825+620):5+(504+2 730):3=
1 445 +3 234 : 3 =
1 445 + 1 078 =
2 523
524 123+14 721:3-14 200:100+17 245x15=
524 123+4 907-142+258 675=
529 030 -142+258 675=
528 888 + 258 675 =
787 563
2 .
1 656 : 8 + 37 × 209 =
207 + 7 733 =
7 940
3 .
prima etapă = 314 km
a doua etapă = 314 km × 2 = 628 km
a treia etapă = 1 251 km - (314 km + 628 km )=
1 251 km - 942 km =
309 km