Номер 1074

1) 4 7/8 + (–3 1/9) = 4 7/8 – 3 1/9 = 4 63/72 - 3 8/72 = 1 55/72

2) –4 2/7 + (–5 1/3) = –(4 6/21 + 5 7/21) = –9 13/21

3) –7 2/9 + 3 5/6 = –(7 2/9 – 3 5/6) = –(6 11/9 – 3 5/6) = –(6 22/18 - 3 15/18) = –3 7/18

4) –12 + 9 8/11 = –(12 – 9 8/11) = –(11 11/11 – 9 8/11) = –2 3/11

5) –13/10 + 2,7 = –1,3 + 2,7 = 1,4

6) –5,25 + 4 3/4 = –5,25 + 4,75 = –(5,25 – 4,75) = –0,5

7) 2,81 + (–1 7/10) = 2,81 + (–1,7) = 1,11

8) 1 8/9 + (–2,05) = 1 8/9 + (–2 5/100) = 1 8/9 + (–2 1/20) = –(2 1/20 – 1 8/9) = –(1 21/20 – 1 8/9) = –(1 189/180 - 1 160/180) = – 29/180

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