Выполните действия: А) 5 + 2 3/8; ж) 3 8/11 + 5 2/11; м) 4 5/11 - 2 8/11 б) 10 3/4 - 7; з) 9 7/12 - 7 6/12; н) 4 - 5/9

 А) 5 + 2 3/8 = 4 8/8 – 2 3/8 = (4 – 2) + (8/8 – 3/8) = 2 5/8.

ж) 3 8/11 + 5 2/11 = (3 + 5) + (8/11 + 2/11) = 8 + 10/11 = 8 10/11.

м) 4 5/11 - 2 8/11 = 49/11 – 30/11 = (49 - 30) / 11 = 19/11 = 1 8/11.

б) 10 3/4 – 7 = (10 – 7) + 3/4 = 3 3/4.  

з) 9 7/12 - 7 6/12 = (9 - 7) + (7/12 – 6/12) = 2 + 1/12 = 2 1/12.

н) 4 - 5/9 = 3 9/9 – 5/9 = 3 4/9.

в) 4 1/6 + 10 = (4 + 10) + 1/6 = 14 1/6.

и) 4 3/5 + 2 4/5 = (4 + 2) + (3/5 + 4/5) = 6 +7/5 = 6 + 1 2/5 = 7 2/5.  

о) 8 - 7/12 = 7 12/12 – 7/12 = 7 + (12/12 – 7/12) = 7 + 5/12 = 7 5/12.

г) 12 8/15 – 12 = 8/15.

к) 8 9/13 + 7 12/13 = (8 + 7) + (9/13 + 12/13) = 15 + 21/13 = 15 + 1 8/13 = 16 8/13.

п) 5 - 3 3/8 = 2 3/8.

д) 4 1/9 + 3 4/9 = (4 + 3) + (1/9 + 4/9) = 7 + 5/9 = 7 5/9.

л) 5 3/5 - 1 4/5 = 28/5 – 9/5 = 19/5 = 3 4/5.

р) 4 - 3 5/9 = 3 9/9 – 3 5/9 = 4/9.

е) 7 7/5 - 4 3/7 = 42/5 – 31/7 = (42 * 7) / (5 * 7) – (31 * 5) / (7 * 5) = 294/35 – 155/35 = 139/35 = 3 34/35.