Сколько будет 2x в квадрате - x в квадрате

9.999.999
+ 100
10000099

19 * 30 = 19 * (3 * 10) = (19 * 3) * 10 = 57 * 10 = 570

15 * 14 = 15 * (2 * 7) = (15 * 2) * 7 = 30 * 7 = 210

15 * 16 = 15 * (4 * 4) = (15 * 4 ) * 4 = 60 * 4 = 240

27 * 40 = 27 * (4 * 10) = (27 * 4) * 10 = 108 * 10 = 1080

18 * 500 = 18 * (5 * 100) = (18 * 5) * 100 = 90 * 100 = 9000

9 * 4000 = 9 * (4 * 1000) = (9 * 4) * 1000 = 36 * 1000 = 36000

4,200
вот ответ
0,012
* 350
60
+ 36
= 4,200

36= 6+30, 30:6=5
48=6+42, 42:6=7
24=6+18, 18:6=3
6=6+0, 0:6=0
54=6+48, 48:6=8