Номер 12
1) 192 + 128 = 320
2) 200 * 2 = 400
3) 8 * 120 = 960
4) 245 * 4 = 980
5) 475 - (125 - 72) = 475 - 53 = 422
6) 308 * 3 = 924
7) 350 : 7 = 50
8) 7 + 30 + 25 = 62
9) 25 * 40 = 1000 дм = 100 м
10) 250 - 7*32 = 250 - 224 = 26 р
Номер 13
1) 20 * 37 = 740
2) 240 * 3 = 720
3) 7 * 12 + 3 = 87
4) (25+38) : 7 = 9
5) 856 : 4 = 214
6) 870 - (34 + 65) = 771
7) 5
8) 35 * 100 = 3500 см
9) P = 12 * 2 + 4 * 2 = 24 + 8 = 32
a = 32 : 4 = 8 см (одна сторона)
S = 8 * 8 = 64 см²
10) 20 * 11 = 220 дней