Question

за 1 номер #54 мне лень его решать

Answer 1

Пошаговое объяснение:

$\frac{7}{9} + 3 \frac{2}{9} = \frac{7}{9} + \frac{29}{9} = \frac{7 + 29}{9} = \frac{36}{9} = 4$

$9 - 5 \frac{1}{4} = 9 - \frac{21}{4} = \frac{36 - 21}{4} = \frac{15}{4} = 3 \frac{3}{4}$

$1 \frac{7}{8} + 2 \frac{6}{8} = 3 \frac{7 + 6}{8} = 3 \frac{13}{8} = 4 \frac{5}{8}$

$4 \frac{5}{7} - 1 \frac{6}{7} = \frac{33}{7} - \frac{13}{7} = \frac{33 - 13}{7} = \frac{20}{7} = 2 \frac{6}{7}$

$15 \frac{2}{9} - (7 \frac{1}{9} + 4 \frac{5}{9} ) = 15 \frac{2}{9} - (11 \frac{1 + 5}{9} ) = 15 \frac{2}{9} - 11 \frac{6}{9} = 3 \frac{11 - 6}{9} = 3 \frac{5}{9}$

$(2 \frac{5}{7} + 8 \frac{2}{7} ) - 4 \frac{7}{8} = (10 \frac{5 + 2}{7} ) - 4 \frac{7}{8} = (10 \frac{7}{7} ) - 4 \frac{7}{8} = 11 - 4 \frac{7}{8} = \frac{88 - 39}{8} = \frac{49}{8} = 6 \frac{1}{8}$

$(4 \frac{2}{5} + 3 \frac{4}{5} ) - (12 - 8 \frac{1}{5} ) = (7 \frac{2 + 4}{5} ) - (12 - \frac{41}{5} ) = (7 \frac{6}{5} ) - ( \frac{60 - 41}{5} ) = 8 \frac{1}{5} - \frac{19}{5} = \frac{41 - 19}{5} = \frac{22}{5} = 4 \frac{2}{5}$

$12 \frac{6}{11} - (5 \frac{4}{11} + 6 \frac{9}{11} - 2 \frac{3}{11} ) = 12 \frac{6}{11} - (9 \frac{4 + 9 - 3}{11} ) = 12 \frac{6}{11} - 9 \frac{10}{11} = 2 \frac{17 - 10}{11} = 2 \frac{7}{11}$