ЗАДАЧІ НА ПОВТОРЕННЯ » 48

Обчисліть: 1) –99 – 11 = –110; 2) –99 + 11 = –88; 3) 35 – 42 = –7; 4) –41 + 115 = 74; 5) –27 + (–80) = –107; 6) 43,121 + (–56,013) + (–40,021) + (–3,087) = 43,121 – 40,021 + (–56,013 – 3,087) = 3,1 + (–59,1) = –56; 7) –109,38 + (–14,48) + (–40,62) + (–35,52) = –109,38 + (–40,62) + (–14,48) + (–35,52) = –150 + (–50) = –200. 8) ((–4/5) + (–7/10)) + (–3/5) = (–(8 + 7)/10) + (–6/10) = –(15 + 6)/10 = –21/10 = –21/10.