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

Toán Lớp 8: Khai triển: 1. (x+2y)^3 2. (x-2y)^3 3. (3x-5y^2)^3 4. (x+2)^3 5. (2x-1)^3 6. (3xy-2)^3

Toán Lớp 8: Khai triển:
1. (x+2y)^3
2. (x-2y)^3
3. (3x-5y^2)^3
4. (x+2)^3
5. (2x-1)^3
6. (3xy-2)^3

Comments ( 2 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
    1. (x+2y)^3 = x^3 + 6x^2y + 12xy^2 + 8y^3
    2. (x-2y)^3 = x^3 – 6x^2y + 12xy^2 – 8y^3
    3. (3x-5y^2)^3 = -125y^6+225xy^4-135x^2y^2+27x^3
    4. (x+2)^3 = x^3 + 6x^2 + 12x + 8
    5. (2x-1)^3 = 8x^3 – 12x^2 + 6x – 1
    6. (3xy-2)^3 = 27x^3y^3-54x^2y^2+36xy-8
    (a+b)^3 = a^3 + 3a^2b + 3ab^2 + b^3
    (a-b)^3 = a^3 – 3a^2b + 3ab^2 – b^3

  2. 1)
    (x+2y)^3
    =x^3+6x^2y+12xy^2+8y^3
    2)
    (x-2y)^3
    =x^3-6x^2y+12xy^2-8y^3
    3)
    (3x-5y^2)^3
    =27x^3-135x^2y^2+225xy^4-125y^6
    4)
    (x+2)^3
    =x^3+6x^2+12x+8
    5)
    (2x-1)^3
    =8x^3-12x^2+6x-1
    6)
    (3xy-2)^3
    =27x^3y^3-54x^2y^2+36xy-8

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