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با توجه به نتیجه ای که از فعّالیت قبل گرفته اید، حاصل عبارت های زیر را به دست آورید.
\(\begin{array}{l}( + \frac{3}{5}) \times ( - \frac{4}{7}) = \\\\( + \frac{2}{3}) \times ( - \frac{5}{7}) = \\\\( - \frac{6}{{35}}) \times ( - \frac{{21}}{8}) = \\\\ - \frac{4}{7} \times ( + 12) = \\\\( - \frac{3}{{11}}) \times ( + \frac{{11}}{6}) = \\\\ - 1/2 \times ( - 0/1) = \\\\ - 1\frac{1}{3} \times \frac{3}{8} = \\\\ - 2\frac{1}{4} \times ( - 1\frac{1}{3}) = \end{array}\)
\(\begin{array}{l}( + \frac{3}{5}) \times ( - \frac{4}{7}) = - \frac{3}{5} \times \frac{4}{7} = - \frac{{3 \times 4}}{{5 \times 7}} = - \frac{{12}}{{35}}\\\\( + \frac{2}{3}) \times ( - \frac{5}{7}) = - \frac{2}{3} \times \frac{5}{7} = - \frac{{2 \times 5}}{{3 \times 7}} = - \frac{{10}}{{21}}\\\\( - \frac{6}{{35}}) \times ( - \frac{{21}}{8}) = + \frac{6}{{35}} \times \frac{{21}}{8} = \frac{{6 \times 21}}{{35 \times 8}} = \frac{{3 \times 3}}{{5 \times 4}} = \frac{9}{{20}}\\\\ - \frac{4}{7} \times ( + 12) = - \frac{4}{7} \times \frac{{12}}{1} = - \frac{{4 \times 12}}{{7 \times 1}} = - \frac{{48}}{7}\\\\( - \frac{3}{{11}}) \times ( + \frac{{11}}{6}) = - \frac{3}{{11}} \times \frac{{11}}{6} = - \frac{{3 \times 11}}{{11 \times 6}} = - \frac{3}{6} = - \frac{1}{2}\\\\ - 1/2 \times ( - 0/1) = + 1/2 \times 0/1 = + 0/12\\\\ - 1\frac{1}{3} \times \frac{3}{8} = - \frac{4}{3} \times \frac{3}{8} = - \frac{{4 \times 3}}{{3 \times 8}} = - \frac{{12}}{{24}} = - \frac{1}{2}\\\\ - 2\frac{1}{4} \times ( - 1\frac{1}{3}) = - \frac{9}{4} \times ( - \frac{4}{3}) = + \frac{9}{4} \times \frac{4}{3} = \frac{{9 \times 4}}{{4 \times 3}} = \frac{{36}}{{12}} = 3\end{array}\)
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