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

Toán Lớp 7: 2 . x ( x -1/7 ) = 0 3/4+1/4 : x = 2/5

Toán Lớp 7: 2 . x ( x -1/7 ) = 0
3/4+1/4 : x = 2/5

Comments ( 2 )

  1. 2x(x-1/7)=0
    ⇔x(x-1/7)=0
    ⇔x=0
    x-1/7=0⇔x=1/7
    Vậy x={0,1/7}
    b,
    3/4+1/4: x=2/5
    ⇔1/4: x=2/5-3/4
    ⇔1/4: x=-7/20
    ⇔x=1/4. -20/7
    ⇔x=-5/7
    Vậy x=-5/7
     

  2. Giải đáp+Lời giải và giải thích chi tiết:
     a) 2x(x-1/7)=0
    =>$\left[\begin{matrix} 2x=0\\ x-\dfrac{1}{7}=0\end{matrix}\right.$
    =>$\left[\begin{matrix} x=0\\ x=\dfrac{1}{7}\end{matrix}\right.$
    Vậy x=1/7 hoặc x=0
     b) 3/4+1/4:x=2/5
    =>1/4:x=2/5-3/4
    =>1/4:x=(-7)/20
    =>x=1/4:(-7)/20
    =>x=(-5)/7
     Vậy x=(-5)/7

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