a. 3 3/4 + 1 3 / 8 – 2/3 b. 3/7 x 4/5 + 5/7 c.3/12 : 2/3 + 1 1/8

Question

a. 3 3/4 + 1 3 / 8 – 2/3
b. 3/7 x 4/5 + 5/7
c.3/12 : 2/3 + 1 1/8

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Huy Gia 1 year 2020-11-11T11:10:43+00:00 2 Answers 60 views 0

Answers ( )

    0
    2020-11-11T11:12:10+00:00

    Bạn tham khảo :

    a . 

    $3 \dfrac{3}{4} + 1 \dfrac{3}{8} – \dfrac{2}{3}$

    $=\dfrac{15}{4} + \dfrac{11}{8} – \dfrac{2}{3}$

    $= \dfrac{41}{8} – \dfrac{2}{3}$
    $=\dfrac{107}{24}$

    b . 

    $\dfrac{3}{7} × \dfrac{4}{5} + \dfrac{5}{7}$

    $= \dfrac{12}{35} + \dfrac{5}{7}$

    $=\dfrac{37}{35}$

    c. 

    $\dfrac{3}{12} : \dfrac{2}{3} + 1 \dfrac{1}{8}$

    $= \dfrac{3}{8} + \dfrac{9}{8}$

    $= \dfrac{3}{2}$

     

    0
    2020-11-11T11:12:10+00:00

    Đáp án:

     

    Giải thích các bước giải:

    a. `3 3/4 + 1 3 / 8 – 2/3 `

    `=41/8-2/3`

    `=107/24`

    b. `3/7 \times 4/5 + 5/7 `

    `=12/35+5/7`

    `=37/35`

    c. `3/12 : 2/3 + 1 1/8`

    `=3/8+1 1/8`

    `=3/2`

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