ЧАСТИНА 2 - Вправи: 1111

1111. Знайди значення виразу:

1) 123 + (–178) + 56 + (–2712) = 123 + 56 + ((–178) + (–2712)) = 14 + 56 + (–321 + 1424) = 212 + (–33524) = 212 + (–41124) = –(33524 – 212) = –135 - 1224 = –12324;

2) 112 + (–1725) + 1234 = 112 + 1234 + (–1725) = 132 + 34 + (–1725) = –(1725 – 1414) = –38 - 520 = –3320.

3) –337 + 7914 + (–4521) = (–337 + (–4521)) + 7914 = –79 + 521 + 7914 = –71421 + 7914 = –723 + 7914 = – 2842 + 2742 = – 142;

4) –1,3 + (–1710) + 323 = –1,3 + (–1,7) + 323 = –3 + 323 = 23;

5) –2,5 + 156 + (–216) + (–3,7) = –2,5 + (–3,7) + (156 + (–216)) = –6,2 + (–(216 – 156)) = –6,2 + (– 13) = –615 + (–13) = –6815;

6) 5,2 + (–4716) + 5380 + (–4,7) = (515 + 5380) + (–4716 + (–4710)) = 1016 + 380+ (–835 + 5680) = 101980 + (–89180) = 101980 + (–91180) = 1880 = 1110.