Найдите значение 1)12/7:(6/7-3/4) 2)5/6+5/2*2/3 3)(1целая 6/7-1,6):1/70 4)(1/13-11/4)*26 5)(5/12-3/20)*45/2 6)(13/3-2,8)*9/2 7)30/6*0,5*(-10/3)

1) 12/7 : (6/7 - 3/4) = 12/7 : ((6 * 4)/28 - (3 * 7)/28) = 12/7 : (24/28 - 21/28) = 12/7 : (24 - 21)/28 = 12/7 : 3/28 = 12/7 * 28/3 = 4 * 4 = 16.

2) 5/6 + 5/2 * 2/3 = 5/6 + 5/3 = 5/6 + (5 * 2)/6 = 5/6 + 10/6 = (5 + 10)/6 = 15/6 = 5/2 = 2.5.

3) (1 6/7 - 1,6) : 1/70 = ((1 * 7 + 6)/7 - 8/5) * 70 = (13/7 - 8/5) * 70 = ((13 * 5)/35 - (8 * 7)/35) * 70 = (65/35 - 56/35) * 70 = (65 - 56)/35 * 70 = 9/35 * 70 = 9 * 2 = 18.

4) (1/13 - 11/4) * 26 = ((1 * 4)/52 - (11 * 13)/52) * 26 = (4/52 - 143/52) * 26 = (4 - 143)/52 * 26 = - 139/52 * 26 = - 139/2 = - 69.5.

5) (5/12 - 3/20) * 45/2 = ((5 * 5)/60 - (3 * 3)/60) * 45/2 = (25/60 - 9/60) * 45/2 = (25 - 9)/60 * 45/2 = 16/60 * 45/2 = 6.

6) (13/3 - 2,8) * 9/2 = (13/3 - 14/5) * 9/2 = ((13 * 5)/15 - (14 * 3)/15) * 9/2 = (65/15 - 42/15) * 9/2 = (65 - 42)/15 * 9/2 = 23/15 * 9/2 = 6.9.

7) 30/6 * 0,5 * (- 10/3) = 5 * 1/2 * (- 10/3) = - 50/6 = - 8 1/3.