Найдите значение выражения: 1)4 2/3*6-1 23/42*3 - вопрос №62642321423612342311321812951253103 от sofiya130308 05.10.2020 04:01

Question

Математика: Найдите значение выражения: 1)4 2/3*6-1 23/42*3 1/13+2 1/8*1 29/51 2)(5 3/10-3 4/5*13/38)*5/84+2 1/12*4/15

sofiya130308 · Answer

1) 4 2/3 * 6 - 1 23/42 * 3 1/13 + 2 1/8 * 1 29/51 = 26 4/7
1) 4 2/3 * 6 = 14/3 * 6/1 = 14/1 * 2/1 = 14 * 2 = 28
2) 1 23/42 * 3 1/13 = 65/42 * 40/13 = 5/21 * 20/1 = 100/21 = 4 16/21
3) 2 1/8 * 1 29/51 = 17/8 * 80/51 = 1/1 * 10/3 = 10/3 = 3 1/3
4) 28 - 4 16/21 = 27 21/21 - 4 16/21 = 23 5/21
5) 23 5/21 + 3 1/3 = 23 5/21 + 3 7/21 = 26 12/21 26 4/7
2) (5 3/10 - 3 4/5 * 13/38) * 5/84 + 2 1/12 * 4/15 = 50/63
1) 3 4/5 * 13/38 = 19/5 * 13/38 = 1/5 * 13/2 = 13/10 = 1 3/10
2) 5 3/10 - 1 3/10 = 4
3) 4 * 5/84 = 5/21
4) 2 1/12 * 4/15 = 25/12 * 4/15 = 5/3 * 1/3 = 5/9
5) 5/21 + 5/9 = 15/63 + 35/63 = 50/63