84 ⋅ 10 - 40 = 840 - 40 = 800
78 ⋅ 10 - 700 = 780 - 700 = 80
50 : 50 ⋅ 100 = 1 ⋅ 100 = 100
24 ⋅ 10 : 8 = 240 : 8 = 30
107 ⋅ 7 = 749
206 ⋅ 4 = 824
10 ⋅ (920 - 20) = 10 ⋅ 900 = 9000
8 ⋅ (720 - 700) = 8 ⋅ 20 = 160
15 ⋅ 2 ⋅ 100 = 30 ⋅ 100 = 3000
48 : 3 ⋅ 10 = 16 ⋅ 10 = 160
250 ⋅ 4 = 1000
105 ⋅ 8 = 840
25 ⋅ 4 ⋅ 100 = 100 ⋅ 100 = 10000
100 : 2 : 10 = 50 : 10 = 5
320 ⋅ 3 = 960
430 ⋅ 2 = 860
184 ⋅ 100 - 300 = 18400 - 300 = 18100
100 ⋅ 391 - 3000 = 39100 - 3000 = 36100
180 : 2 + 210 ⋅ 4 = 90 + 840 = 930
150 : 3 + 250 ⋅ 4 = 50 + 1000 = 1050
125 ⋅ 4 = 500
125 ⋅ 8 = 1000
182 ⋅ 2 = 364
316 ⋅ 3 = 948
Ответ: смотри решение выше