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

Toán Lớp 8: x⁴-3x²y²+9y⁴ làm giúp mìnhbnhas

Toán Lớp 8: x⁴-3x²y²+9y⁴ làm giúp mìnhbnhas

Comments ( 2 )

  1. $x^{4}$ – 3x²y² + $9y^{4}$ 
    = (x²)² + 6x²y² + (3y²)² – 9x²y²
    = (x² + 3y²) – (3xy)²
    = ( x² + 3y² – 3xy)(x² + 3y² + 3xy)

  2. x^{4} – 3x^{2}y^{2} + 9y^{4}
    = (x^{2})^{2} + 6x^{2}y^{2} + (3y^{2})^{2} – 9x^{2}y^{2}
    = (x^{2} + 3y^{2}) + (6x^{2}y^{2} – 9x^{2}y^{2})
    = (x^{2} + 3y^{2}) + (3x^{2}y^{2})
    = (x^{2} + 3y^{2}) + (3xy)^{2}
    = (x^{2} + 3y^{2} + 3xy) . (x^{2} + 3y^{2} – 3xy)
     

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

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