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

Toán Lớp 11: Khai triển đẳng thức sau A^4-B^4

Toán Lớp 11: Khai triển đẳng thức sau A^4-B^4

Comments ( 2 )

  1. a^4 – b^4
    = (a^2)^2 – (b^2)^2
    = (a^2 – b^2)(a^2 + b^2)
    = (a – b)(a + b)(a^2 + b^2)

  2. A^4-B^4
    = (A^2)^2-(B^2)^2
    =(A^2-B^2)(A^2+B^2)
    =(A-B)(A+B)(A^2+B^2)
    text{áp dụng hđt}  x^2-y^2=(x-y)(x+y)

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