11. Раціональні числа - 14. Віднімання чисел » 552

Виконай віднімання а) 1/5 – 3/5 = –2/5; –2/7 – 3/7 = –5/7; 5/6 – (–1/6) = 6/6 = 1; –7/12 – (–5/12) = –2/12; б) 2/9 – 25/9 = –21/3; –3/8 – 17/8 = –110/8 = –21/4; 33/16 – (–25/16) = 51/8; –64/7 – (–25/7) = –36/7; в) –2/9 – 5/6 = –4/18 – 15/18 = –19/18 = –11/18; 2/3 – (–5/6) = 7/6 = 11/6; –45/12 – (–31/18) = –415/36 – (–32/36) = –113/36; –2/3 – 1,8 = –2/3 – 14/5 = –10/15 – 112/15 = –122/15 = –27/15.