1 вариант. Вычисли: 1) 4 3/7 + 2 2/7; 2) 1 2/5 + 3 1/3; 3) 5 5/6 + 2 3/4; 4) 8 + 4 2/9; 5) 3 3/5 + 2 1/6; 6) 7 4/5 − 3 1/5; 7) 9 1/8 − 5 3/4; 8) 6 − 2 5/6; 9) 5 3/7 − 2 3/7; 10) 3 3/8 · 4; 11) 5 1/3 · 3/8; 12) 2 2/5 · 1 1/4; 13) 2 1/2 · 2 2/7; 14) 8 2/3 : 4; 15) 4 1/2 : 3/4; 16) 7 1/5 : 1 4/5; 17) 6 3/4 : 1 1/2.

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Accepted Answer

\(4\frac{3}{7}+2\frac{2}{7}=6\frac{5}{7}\).
\(1\frac{2}{5}+3\frac{1}{3}=\frac{7}{5}+\frac{10}{3}=\frac{71}{15}=4\frac{11}{15}\).
\(5\frac{5}{6}+2\frac{3}{4}=\frac{35}{6}+\frac{11}{4}=\frac{103}{12}=8\frac{7}{12}\).
\(8+4\frac{2}{9}=12\frac{2}{9}\).
\(3\frac{3}{5}+2\frac{1}{6}=5+\frac{18}{30}+\frac{5}{30}=5\frac{23}{30}\).
\(7\frac{4}{5}-3\frac{1}{5}=4\frac{3}{5}\).
\(9\frac{1}{8}-5\frac{3}{4}=9\frac{1}{8}-5\frac{6}{8}=3\frac{3}{8}\).
\(6-2\frac{5}{6}=3\frac{1}{6}\).
\(5\frac{3}{7}-2\frac{3}{7}=3\).
\(3\frac{3}{8}\cdot4=\frac{27}{8}\cdot4=13\frac{1}{2}\).
\(5\frac{1}{3}\cdot\frac{3}{8}=\frac{16}{3}\cdot\frac{3}{8}=2\).
\(2\frac{2}{5}\cdot1\frac{1}{4}=\frac{12}{5}\cdot\frac{5}{4}=3\).
\(2\frac{1}{2}\cdot2\frac{2}{7}=\frac{5}{2}\cdot\frac{16}{7}=\frac{40}{7}=5\frac{5}{7}\).
\(8\frac{2}{3}:4=\frac{26}{3}:4=\frac{13}{6}=2\frac{1}{6}\).
\(4\frac{1}{2}:\frac{3}{4}=\frac{9}{2}\cdot\frac{4}{3}=6\).
\(7\frac{1}{5}:1\frac{4}{5}=\frac{36}{5}:\frac{9}{5}=4\).
\(6\frac{3}{4}:1\frac{1}{2}=\frac{27}{4}:\frac{3}{2}=\frac{9}{2}=4\frac{1}{2}\).

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