Đáp án:
$\frac{1}{2}.\frac{1}{2}=\frac{1}{4}\\
\frac{1}{2}.\frac{-2}{3}=\frac{-1}{3}\\
\frac{1}{2}.\frac{3}{4}=\frac{3}{8}\\
\frac{1}{2}.\frac{-4}{5}=\frac{-2}{5}\\
\frac{-2}{3}.\frac{1}{2}=\frac{-1}{3}\\
\frac{-2}{3}.\frac{-2}{3}=\frac{4}{9}\\
\frac{-2}{3}.\frac{3}{4}=\frac{-1}{2}\\
\frac{-2}{3}.\frac{-4}{5}=\frac{8}{15}\\
\frac{3}{4}.\frac{1}{2}=\frac{3}{8}\\
\frac{3}{4}.\frac{-2}{3}=\frac{-1}{2}\\
\frac{3}{4}.\frac{3}{4}=\frac{9}{16}\\
\frac{3}{4}.\frac{-4}{5}=\frac{-3}{5}\\
\frac{-4}{5}.\frac{1}{2}=\frac{-2}{5}\\
\frac{-4}{5}.\frac{-2}{3}=\frac{8}{15}\\
\frac{-4}{5}.\frac{3}{4}=\frac{-3}{5}\\
\frac{-4}{5}.\frac{-4}{5}=\frac{16}{25}$
Giải thích các bước giải:
$\frac{1}{2}.\frac{1}{2}=\frac{1}{4}\\
\frac{1}{2}.\frac{-2}{3}=\frac{1.(-2)}{2.3}=\frac{-1}{3}\\
\frac{1}{2}.\frac{3}{4}=\frac{1.3}{2.4}=\frac{3}{8}\\
\frac{1}{2}.\frac{-4}{5}=\frac{1.(-4)}{2.5}=\frac{-2}{5}\\
\frac{-2}{3}.\frac{1}{2}=\frac{(-2)}{2.3}=\frac{-1}{3}\\
\frac{-2}{3}.\frac{-2}{3}=\frac{(-2).(-2)}{3.3}=\frac{4}{9}\\
\frac{-2}{3}.\frac{3}{4}=\frac{(-2).3}{3.4}=\frac{-1}{2}\\
\frac{-2}{3}.\frac{-4}{5}=\frac{(-2)(-4)}{3.5}=\frac{8}{15}\\
\frac{3}{4}.\frac{1}{2}=\frac{3.1}{4.2}=\frac{3}{8}\\
\frac{3}{4}.\frac{-2}{3}=\frac{3.(-2)}{4.3}=\frac{-1}{2}\\
\frac{3}{4}.\frac{3}{4}=\frac{3.3}{4.4}=\frac{9}{16}\\
\frac{3}{4}.\frac{-4}{5}=\frac{3.(-4)}{4.5}=\frac{-3}{5}\\
\frac{-4}{5}.\frac{1}{2}=\frac{-4}{2.5}=\frac{-2}{5}\\
\frac{-4}{5}.\frac{-2}{3}=\frac{(-4).(-2)}{3.5}=\frac{8}{15}\\
\frac{-4}{5}.\frac{3}{4}=\frac{(-4).3}{4.5}=\frac{-3}{5}\\
\frac{-4}{5}.\frac{-4}{5}=\frac{(-4).(-4)}{5.5}=\frac{16}{25}$
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