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

Toán Lớp 8: (5x-4)^2-49x^2 phân tích thành nhân tử

Toán Lớp 8: (5x-4)^2-49x^2 phân tích thành nhân tử

Comments ( 2 )

  1. (5x-4)^2-49x^2
    =(5x-4)^2-(7x)^2
    =(5x-4-7x)(5x-4+7x)
    =(-2x-4)(12x-4)
    =2(-x-2)4(3x-1)
    =8(-x-2)(3x-1)

  2. (5x-4)^2-49x^2
    =(5x-4)^2-(7x)^2
    =(5x-4-7x)(5x-4+7x)
    =(-2x-4)(12x-4)
    Công thức : A^2-B^2=(A-B)(A+B)
     

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

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