39. Решите уравнение: а) x + 2/7 = 5/14; б) x − 1/4 = 6/11; в) 3/8 + h = 11/18; г) 4/15 − y = 7/30; д) 3/8 + a = 5/6; е) 7/12 − y = 3/32; ж) 5/13 + t = 7/10; з) 2/3 − b = 1/5; и) t − 1/6 = 11/42.

1. x = 5/14 − 2/7 = 5/14 − 4/14 = 1/14.

2. x = 6/11 + 1/4 = 24/44 + 11/44 = 35/44.

3. h = 11/18 − 3/8 = 44/72 − 27/72 = 17/72.

4. y = 4/15 − 7/30 = 8/30 − 7/30 = 1/30.

5. a = 5/6 − 3/8 = 20/24 − 9/24 = 11/24.

6. y = 7/12 − 3/32 = 56/96 − 9/96 = 47/96.

7. t = 7/10 − 5/13 = 91/130 − 50/130 = 41/130.

8. b = 2/3 − 1/5 = 10/15 − 3/15 = 7/15.

9. t = 11/42 + 1/6 = 11/42 + 7/42 = 18/42 = 3/7.

Ответ: а) x = 1/14; б) x = 35/44; в) h = 17/72; г) y = 1/30; д) a = 11/24; е) y = 47/96; ж) t = 41/130; з) b = 7/15; и) t = 3/7.