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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 6: (x+1,5):3 1/5=(-5)/8 (8 4/5x-50):0,4=51

Toán Lớp 6: (x+1,5):3 1/5=(-5)/8
(8 4/5x-50):0,4=51

Comments ( 2 )

  1. (x+1,5):3  1/5=(-5)/8

    (x+3/2):16/5  =(-5)/8

    (2x+3)/2xx5/16=(-5)/8

    (2x+3)/2=(-5)/8:5/16

    (2x+3)/2=-2

    2x+3=-4

    2x=-7

    x=-7/2

    x=-3,5

    —————
    (8  4/5x-50):0,4=51
    (44/5x-50):2/5=51
    (44x-250)/5xx5/2=51
    (44x-250)xx1/2=51
    44x-250=102
    44x=102+250
    44x=352
    x=352/44
    x=8

  2. Giải đáp:
     
    Lời giải và giải thích chi tiết:
    $(x+1,5):3\dfrac{1}{5}=\dfrac{-5}{8}$ 
    ⇒$x+1,5=\dfrac{-5}{8}.\dfrac{16}{5}$ 
    ⇒$x+1,5=-2$ 
    ⇒$x=(-2)-1,5$
    ⇒$x=-3,5$
    $(8\dfrac{4}{5}x-50):0,4=51$
    ⇒$8\dfrac{4}{5}x-50=51.0,4$
    ⇒$8\dfrac{4}{5}x-50=\dfrac{102}{5}$
    ⇒$\dfrac{44}{5}x=\dfrac{102}{5}+50$
    ⇒$\dfrac{44}{5}x=\dfrac{352}{5}$
    ⇒$x=\dfrac{352}{5}:\dfrac{44}{5}$
    ⇒$x=8$
    $\text { XIN HAY NHẤT ~~~}$

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222-9+11+12:2*14+14 = ? ( )