Tinh bang cách thuan tiện nhat a)3/5×8/27×5/3 B)7/19×1/3×+7/19×2/3

Tinh bang cách thuan tiện nhat a)3/5×8/27×5/3
B)7/19×1/3×+7/19×2/3

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  1. Đáp án:

    \(\begin{array}{l}
    a)\,\,\frac{8}{{27}}\\
    b)\,\,\,\frac{7}{{19}}
    \end{array}\)

    Giải thích các bước giải:

    \[\begin{array}{l}
    a)\,\,\frac{3}{5} \times \frac{8}{{27}} \times \frac{5}{3} = \frac{{3 \times 8 \times 5}}{{5 \times 27 \times 3}} = \frac{8}{{27}}.\\
    b)\,\,\frac{7}{{19}} \times \frac{1}{3} + \frac{7}{{19}} \times \frac{2}{3} = \frac{7}{{19}}\left( {\frac{1}{3} + \frac{2}{3}} \right) = \frac{7}{{19}}.
    \end{array}\]

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