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

Toán Lớp 7: Tìm số hữu tỉ x: $\frac{1}{x-1}$ + $\frac{-2}{3}$( $\frac{3}{4}$-$\frac{6}{5}$ ) = $\frac{5}{2-2x}$

Toán Lớp 7: Tìm số hữu tỉ x:
$\frac{1}{x-1}$ + $\frac{-2}{3}$( $\frac{3}{4}$-$\frac{6}{5}$ ) = $\frac{5}{2-2x}$

Comments ( 1 )

  1. $\\$
    1/(x-1)+(-2)/3 (3/4 – 6/5) =5/(2-2x) (x \ne 1)
    => 2/(2x-2) + (-2)/3 . (-9)/20  -5/(2-2x)=0
    => – 2/(2-2x) + 3/10 -5/(2-2x)=0
    => (- 2/(2-2x)-5/(2-2x)) +3/10=0
    => (-7)/(2-2x) = (-3)/10
    => -7 = (-3)/10 (2-2x)
    => 2-2x=70/3
    => 2x=(-64)/3
    =>x=(-32)/3 (Thỏa mãn)
    Vậy x=(-32)/3
     

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