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

Toán Lớp 7: x:0.25=9:x nhanh giúp mình với

Toán Lớp 7: x:0.25=9:x nhanh giúp mình với

Comments ( 2 )

  1. x:0,25 = 9:x
    x/(0,25) = 9/x
    x.x=0,25.9
    x^2=2,25
    x^2=(1,5)^2
    x=1,5

  2. Giải đáp:
    x:0.25=9:x
    x/0,25=9/x
    x xx x=9 xx 0,25
    x^2 = 9/4
    x^2 = (3/2)^2
    => $\left[\begin{matrix} x=3/2 \\ x=-3/2 \end{matrix}\right.$
    Vậy x∈{3/2;-3/2}

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

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