A=2/3 + 2/9 + 1/4 _____________________ 4/3 + 4/5 + 2/4

A=2/3 + 2/9 + 1/4
_____________________
4/3 + 4/5 + 2/4

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  1. Đáp án:

    $\dfrac{205}{474}$

    Giải thích các bước giải:

    $A=\dfrac{\dfrac{2}{3}+\dfrac{2}{9}+\dfrac{1}{4}}{\dfrac{4}{3}+\dfrac{4}{5}+\dfrac{2}{4}}$

    $A=\dfrac{\dfrac{24}{36}+\dfrac{8}{36}+\dfrac{9}{36}}{\dfrac{80}{60}+\dfrac{48}{60}+\dfrac{30}{60}}$

    $A=\dfrac{\dfrac{24+8+9}{36}}{\dfrac{80+48+30}{60}}$

    $A=\dfrac{\dfrac{41}{36}}{\dfrac{158}{60}}$

    $A=\dfrac{41}{36}:\dfrac{158}{60}$

    $A=\dfrac{41}{36}\cdot\dfrac{60}{158}$

    $A=\dfrac{205}{474}$

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  2. $A = \dfrac{\dfrac{2}{3}+\dfrac{2}{9}+\dfrac{1}{4}}{\dfrac{4}{3}+\dfrac{4}{5}+\dfrac{2}{4}}$

    $ = \dfrac{\dfrac{41}{36}}{\dfrac{79}{30}}$

    $= \dfrac{41}{36} . \dfrac{30}{79}$

    $ = \dfrac{205}{474}$

     

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