Вычислите представив десятичную дробь в виде обыкновенной 1)4.8-2 3/4 2)9 1/7-5,8

1) 4,8 - 2 3/4 = 48/10 - (2 * 4 + 3)/4 = 24/5 - 11/4 = 96/20 - 55/20 = 41/20;

2) 9 1/7 - 5,8 = (9 * 7 + 1)/7 - 58/10 = 64/7 - 29/5 = 320/35 - 203/35 = 117/35;

3) 15 3/8 - 7,25 = (15 * 8 + 3)/8 - 725/100 = 123/8 - 29/4 = 123/8 - 58/8 = 65/8;

4) 81 2/3 - 63,5 = (81 * 3 + 2)/3 - 635/10 = 245/3 - 127/2 = 490/6 - 381/6 = 109/6;

5) 12,36 - 7 13/20 = 1236/100 - (7 * 20 + 13)/20 = 1236/100 - 765/100 = 471/100;

6) 6,4 - 2 1/15 = 64/10 - (2 * 15 + 1)/15 = 32/5 - 31/15 = 96/15 - 31/15 = 65/15;

7) 5,7 - 3 1/4 = 57/10 - (3 * 4 + 1)/4 = 57/10 - 13/4 = 114/20 - 65/20 = 49/20;

8) 6,4 - 2 1/9 = 64/10 - (2 * 9 + 1)/9 = 32/5 - 19/9 = 288/45 - 95/45 = 193/45.