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

Toán Lớp 8: 2a^2– 2 – 4ab + 2b^2 2x^2–12x + 18 + 2xy – 6y

Toán Lớp 8: 2a^2– 2 – 4ab + 2b^2
2x^2–12x + 18 + 2xy – 6y

Comments ( 2 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
     2a² – 2 – 4ab + 2b²
    = a² + a² – 2 – 2ab – 2ab + b² + b²
    = (a²- 2ab + b²) + (a² – 2ab + b²)
    = (a-b)² + (a-b)² – 2
    2x² – 12x + 18 + 2xy – 6y
    = 2(x² – 6x + 9 + xy – 3y)
    = 2[(x²-6x+9)+(xy-3y)]
    = 2[(x-3)² + y(x-3)]
    = 2[(x-3)(x-3+y)]

  2. 2a^2 – 2 – 4ab + 2b^2
    = a^2 + a^2 – 2 – 2ab – 2ab + b^2 + b^2
    = (a^2 – 2ab + b^2) + (a^2 – 2ab + b^2)
    = (a – b)^2 + (a – b)^2 – 2
    2x^2 – 12x + 18 + 2xy – 6y
    = 2(x^2 – 6x + 9 + xy – 3y)
    = 2[(x^2 – 6x + 9) + (xy – 3y)]
    = 2(x – 3)(x – 3^2)

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