Відповіді до вправ 51 - 100

98. Обчисліть:

1) 2/3 + 7/12 = 8/12 + 7/12 = 15/12 = 11/4;

2) 8/21 – 3/14 = 16/42 – 9/42 = 7/42 = 1/6;

3) 23/5 + 37/10 = 26/10 + 37/10 = 513/10 = 63/10;

4) 5/11 – 2/33 = 15/33 – 2/33 = 13/33;

5) 9/20 + 11/15 = 9/20 + 16/15 =

= 27/60 + 64/60 = 91/60 = 131/60;

6) 54/15 – 12/7 = 528/105 – 130/105 =

= 4133/105 – 130/105 = 3103/105.