Вправи 901 - 1000 » 936

Обчисліть значення виразу: 1) 2/15 + (–3/10) = (4 - 9)/30 = –1/6; 2) –2/3 + 13/15 = (-10 + 13)/15 = 1/5; 3) –45/9 + (–71/6) = –410/18 + (–73/18) = –1113/18; 4) –57/8 + (–63/10) = –535/40 + (–612/40) = –1147/40 = –127/40; 5) –13 + 73/16 = –1216/16 + 73/16 = –513/16; 6) –23/8 + (–15/9) = –227/72 + (–140/72) = –367/72; 7) –29/20 + 57/30 = –227/60 + 474/60 = 247/60; 8) –51/4 + 13/8 = –410/8 + 13/8 = –37/8; 9) 43/7 + (–89/14) = 46/14 + (–89/14) = –43/14.