Номер 1263

1) (a + b)c = (–3,7 + (–6,3)) • 5 = –10 • 5 = –50

    ac + bc = –3,7 • 5 + (–6,3) • 5 = –18,5 + (–31,5) = –50

2) (a – b)c = (–3,7 – (–6,3)) • 5 = 2,6 • 5 = 13

    ac – bc = –3,7 • 5 – (–6,3) • 5 = –18,5 + 31,5 = 13