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

Toán Lớp 8: Phân tích đa thức thành nhân tử a) $a^{6}$ + $a^{4}$ + $a^{2}$ $b^{2}$ + $b^{4}$ – $b^{6}$ b) $x^{3}$ + 3xy + $y^{3}$ – 1

Toán Lớp 8: Phân tích đa thức thành nhân tử
a) $a^{6}$ + $a^{4}$ + $a^{2}$ $b^{2}$ + $b^{4}$ – $b^{6}$
b) $x^{3}$ + 3xy + $y^{3}$ – 1

Comments ( 1 )

  1. a)a^6+a^4+a^2b^2+b^4-b^6
    =(a^2)^3-(b^2)^3+(a^4+a^2b^2+b^4)
    =(a^2-b^2)(a^4+a^2b^2+b^4)+(a^4+a^2b^2+b^4)
    =(a^4+a^2b^2+b^4)(a^2-b^2+1)
    =(a^4+2a^2b^2+b^4-a^2b^2)(a^2-b^2+1)
    =(a^2+b^2-ab)(a^2+b^2+ab)(a^2-b^2+1)
    b)x^3+3xy+y^3-1
    =y^3-xy^2+y^2+x^2y+xy+y+xy^2-x^2y+xy+x^3+x^2+x-y^2+xy-y-x^2-x-1
    =y(y^2-xy+y+x^2+x+1)+x(y^2-xy+y+x^2+x+1)-(y^2-xy+y+x^2+x+1)
    =(y+x-1)(y^2-xy+y+x^2+x+1)
     

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