19.6 * 2 1/2 - (2.0625 - 1 5/12) : 1/8 = 44 2/15
1) 2.0625 - 1 5/12 = 2 1/40 - 1 5/12 = 2 3/120 - 1 50/120 = 1 123/120 - 1 50/120 = 73/120
2) 73/120 : 1/8 = 73/120 * 8/1 = 73/15 = 4 13/15
3) 19.6 * 2 1/2 = 19 6/10 * 2 1/2 = 19 3/5 * 2 1/2 = 98/5 * 5/2 = 98/2 = 49/1 = 49
4) 49 - 4 13/15 = 49/1 - 73/15 = 735/15 - 73/15 = 662/15 = 44 2/15
Ответ: 44 2/15
420 - х = 400:5
420 - x = 80
x = 420 - 80
x = 340
17 костюмов всего;). я в 4 классе
А) 10 2*5 б) 100 2*5 в) 1000 2*5 г) 10000 2*5
1 10 2*5 100 2*5 1000 2*5
1 10 2*5 100 2*5
1 10 2*5
1
10 = 2*5 100 = 2*2*5*5 1000 = 2*2*2*5*5*5 10000 = 2*2*2*2*5*5*5*5