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

Toán Lớp 8: Ptích đa thức thành nhân tử : a. 8x^2y -8xy + 2x b. ( x^2+2x ) (x^2 +4x+3) -24 c. x^2-9 + (x-3)^2

Toán Lớp 8: Ptích đa thức thành nhân tử :
a. 8x^2y -8xy + 2x
b. ( x^2+2x ) (x^2 +4x+3) -24
c. x^2-9 + (x-3)^2

Comments ( 2 )

  1. a)8x^2y8xy+2x=2x(4xy4y+1)
    b.(x^2+2x)(x^2+4x+3)-24
    =x(x+2)(x+1)(x+3)-24
    =(x^2+3x)(x^2+3x+2)-24
    =(x^2+3x+1-1)(x^2+3x+1+1)-24
    =(x^2+3x+1)^2-1-24
    =(x^2+3x+1)^2-25
    =(x^2+3x+1-5)(x^2+3x+1+5)
    =(x^2+3x-4)(x^2+3x+6)
    c, x^2-9 + (x-3)^2.

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