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

Toán Lớp 7: x+2/x+1=4x+5/4x help me please

Toán Lớp 7: x+2/x+1=4x+5/4x
help me
please

Comments ( 2 )

  1. (x+2)/(x+1)=(4x+5)/(4x) ( x \ne 0;-1 )
    ⇔(4x(x+2))/(4x(x+1))=((x+1)(4x+5))/(4x(x+1))
    ⇒4x²+8x-(x+1)(4x+5)=0
    ⇔4x²+8x-(4x²+9x+5)=0
    ⇔4x²-4x²+8x-9x-5=0
    ⇔-x-5=0
    ⇔-x=5
    ⇔x=-5 (TM)
    Vậy x=-5

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

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