Răspuns:
(629-18):30:21=29
800-20*5*40:5:3=700
1000-8*25:120-100:2=995
explicație pas cu pas
800-20*5*40:5:3= 10400
= 780*5*40:5:3=10400
=3900*8:3=10400
=31200:3=10400
=10400
1000-8*25:120-100:2=156 rest 6
= 992*25:120-50=156 rest 6
=24800:120-50=156 rest 6
=206-50= 156 rest 6
=156 rest 6
629 - 18 : 30 :21 =321 rest 5
= 611:30:21=321 rest 5
= 611:1 rest 9=321 rest 5
=321 rest 5
coroana te rog frumos