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

Toán Lớp 9: 5x + 2căn(x+1) – căn (1 -x) = -3

Toán Lớp 9: 5x + 2căn(x+1) – căn (1 -x) = -3

Comments ( 1 )

  1. 5x+2√x+1-√1-x=-3
    ⇔2√x+1-√1-x=-3-5x
    ⇔4x+4-4√x²-1²+1-x=9+30x+25x²
    ⇔4x+4-4x+4+1-x=9+30x+25x²
    ⇔25x²+31x=0
    ⇔x(25x+31)=0
    ⇔x=0 hoặc x=-(31)/(25)

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

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