(4/7 + 3 3/5) . 4,5 + (3/7 – 2 3/5) . 4/5

Question

(4/7 + 3 3/5) . 4,5 + (3/7 – 2 3/5) . 4/5

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Huy Gia 4 years 2020-10-17T06:16:43+00:00 2 Answers 92 views 0

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  1. Verity
    0
    2020-10-17T06:18:30+00:00
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    Minh sửa lại đề, nếu sai thì nói mình nha!

    `(4/7+3 3/5). 4/5+(3/7-2 3/5). 4/5`

    `=(4/7+3 3/5+3/7-2 3/5). 4/5`

    `=[(4/7+3/7)+(3 3/5-2 3/5)]. 4/5`

    `=(1+1). 4/5`

    `=2. 4/5`

    `=8/5`

  2. Calantha
    0
    2020-10-17T06:18:39+00:00
    Reply

    Đáp án:

    $\dfrac{8}{5}$

    Giải thích các bước giải:

     $(\dfrac{4}{7}+3\dfrac{3}{5}).\dfrac{4}{5}+(\dfrac{3}{7}-2\dfrac{3}{5}).\dfrac{4}{5}$

    $=\dfrac{4}{5}.(\dfrac{4}{7}+3\dfrac{3}{5}+\dfrac{3}{7}-2\dfrac{3}{5})$

    $=\dfrac{4}{5}.(1+1)$

    $=\dfrac{4}{5}.2$

    $=\dfrac{8}{5}$

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )