Вправи для повторення за рік » 915

Обчисли значення виразу: а) –23 + 16 = –7; –7 + (–9) = –16; 15 – (–5) = 20; –8 – 6 = –14; б) 64 – 72 = –8; –18 + (–42) = –60; 84 + (–48) = 36; –45 – (–65) = 20; в) –6 • 12 = –72; 42 • (–10) = –420; –16 • (–5) = 80; –17 • (–15) = 255; г) –68 : 2 = – 34; 32 : (–16) = –2; –44 : (–4) = 11; –126 : 18 = –7; ґ) –15 – (–18) = 3; –127 + 33 = –94; 84 • (–4) = –336; –138 : (–23) = 6.