7. Найдите значение выражения: 7.1) 15/2 · 7/5; 7.2) 5/3 · 9/2; 7.3) 3/4 · 6/5; 7.4) 15/4 · 9/5; 7.5) 2/5 · 9/8; 7.6) 3/5 · 25/4; 7.7) 7/5 · 12/35; 7.8) 9/5 · 2/3; 7.9) 21/5 · 3/7; 7.10) 7/6 · 9/5; 7.11) 9/14 · 14/15; 7.12) 23/34 · 17/23; 7.13) 7/15 · 3/7; 7.14) 51/40 · 4/17; 7.15) 23/3 · 3/25.

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Вопрос:

Accepted Answer

\(\frac{15}{2}\cdot\frac75=\frac{21}{2}=10\frac12\).
\(\frac53\cdot\frac92=\frac{15}{2}=7\frac12\).
\(\frac34\cdot\frac65=\frac9{10}\).
\(\frac{15}{4}\cdot\frac95=\frac{27}{4}=6\frac34\).
\(\frac25\cdot\frac98=\frac9{20}\).
\(\frac35\cdot\frac{25}{4}=\frac{15}{4}=3\frac34\).
\(\frac75\cdot\frac{12}{35}=\frac{12}{25}\).
\(\frac95\cdot\frac23=\frac65=1\frac15\).
\(\frac{21}{5}\cdot\frac37=\frac95=1\frac45\).
\(\frac76\cdot\frac95=\frac{21}{10}=2\frac1{10}\).
\(\frac9{14}\cdot\frac{14}{15}=\frac35\).
\(\frac{23}{34}\cdot\frac{17}{23}=\frac12\).
\(\frac7{15}\cdot\frac37=\frac15\).
\(\frac{51}{40}\cdot\frac4{17}=\frac3{10}\).
\(\frac{23}{3}\cdot\frac3{25}=\frac{23}{25}\).

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