tinh bang cach thuan tien nhat; 7/19x 1/3+7/9 x2/3

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tinh bang cach thuan tien nhat; 7/19x 1/3+7/9 x2/3

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Mackenzie 1 tháng 2021-08-30T17:17:21+00:00 1 Answers 9 views 0

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    0
    2021-08-30T17:18:30+00:00

    Đáp án: 7/9

     

    Giải thích các bước giải:

    $\begin{array}{l}
    \frac{7}{9} \times \frac{1}{3} + \frac{7}{9} \times \frac{2}{3}\\
     = \frac{7}{9} \times \left( {\frac{1}{3} + \frac{2}{3}} \right)\\
     = \frac{7}{9} \times \left( {\frac{{1 + 2}}{3}} \right)\\
     = \frac{7}{9} \times \frac{3}{3}\\
     = \frac{7}{9} \times 1 = \frac{7}{9}
    \end{array}$

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