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

Toán Lớp 7: $\frac{3}{2}$.x + $\frac{3}{4}$.x = $\frac{-5}{8}$

Toán Lớp 7: $\frac{3}{2}$.x + $\frac{3}{4}$.x = $\frac{-5}{8}$

Comments ( 2 )

  1. \frac{3}{2}x+\frac{3}{4}x=-5/8
    <=>x(3/2 + 3/4)=-5/8
    <=>x(6/4 + 3/4)=-5/8
    <=>x.9/4=-5/8
    <=>x=-5/8 : 9/4
    <=>x=-5/8 . 4/9
    =>x=-5/18
    Vậy x=-5/18

  2. Lời giải và giải thích chi tiết:
    3/2x + 3/4x = (-5)/8
    ⇒ x(3/2 + 3/4) = (-5)/8
    ⇒ 9/4x = (-5)/8
    ⇒ x = (-5)/8 : 9/4
    ⇒ x = (-5)/8 . 4/9 = (-5)/18
    Vậy  x = (-5)/18

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