Ответы и объяснения

2014-04-10T08:52:26+00:00
1) 3/8-7/12= 9/24 - 14/24 =- 3/24= -1/8
2) -1/8 *3,6= -1/8 *3 3/5= -1/8* 18/5= -9/20
3) 5/18 +2/27= 15/54 + 4//54 = 19/54
4) 19/54 : 1 11/27 = 19/54 : 38/27= 19/54 * 27/38= 19/76
5) -9/20 + 19/76= -171/380 + 95/380= - 76/380= -19/95