Найдите значение выражения:
[tex]1)1 \frac{1}{4} \times 1 \frac{1}{5} \times \frac{1}{6} \times 1 \frac{1}{7} \times 1 \frac{1}{8} - \frac{1}{4} [/tex]
[tex]2)2 \frac{1}{2} \times 1 \frac{2}{5} \times 1 \frac{2}{7} \times 1 \frac{2}{9} \times 1 \frac{2}{11} + \frac{1}{2} [/tex]
[tex]3)2 \frac{1}{3} \times 1 \frac{1}{7} \times 1 \frac{4}{11} \times 1 \frac{4}{15} \times 1 \frac{4}{19} - \frac{2}{3} [/tex]

Решение по действиям:_____________________________  1) 5/4 * 6/5 * 1/6 * 8/7 * 9/8 = 9/28 2) 9/28 - 1/4 = 9/28 - 7/28 = 2/28 = 1/14------------------------------------------------------------1) 5/2 * 7/5 * 9/7 * 11/9 * 13/11 = 13/22) 13/2 + 1/2 = 14/2 = 7------------------------------------------------------------1) 7/3 * 8/7 * 15/11 * 19/15 * 23/19 = (8*23)/(3*11) = 184/332) 184/33 - 2/3 = 184/33 - 22/33 = 162/33 = 4  30/33 = 4  10/11