7800, 4900, 360, 630, 500, 2390
Пошаговое объяснение:
1) 25×78×4 = 100×78 = 7800
2) 2×49×50 = 100×49 = 4900
3) 3×5×8×3 = 3×40×3 = 120×3 = 360
4) 49×9+21×9 = 441+189 = 630
5) 316×5-216×5 = 1580-1080 = 500
6) 239×47+239×53 = 239×100 = 23900
7800, 4900, 360, 630, 500, 2390
Пошаговое объяснение:
1) 25×78×4 = 100×78 = 7800
2) 2×49×50 = 100×49 = 4900
3) 3×5×8×3 = 3×40×3 = 120×3 = 360
4) 49×9+21×9 = 441+189 = 630
5) 316×5-216×5 = 1580-1080 = 500
6) 239×47+239×53 = 239×100 = 23900
Удачи!