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

Toán Lớp 8: Tìm x, biết : (pp dùng hằng đẳng thức) 2 – 25x ² = 0

Toán Lớp 8: Tìm x, biết : (pp dùng hằng đẳng thức)
2 – 25x ² = 0

Comments ( 1 )

  1. 2-25x^2=0
    ⇔25x^2=2
    ⇔x^2=2/25
    ⇔x=±$\sqrt[]{2/5}$

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

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