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

Toán Lớp 8: Phân tích đa thức thành nhân tử 1)x² – 2x – 4y²-4y 2)3a²-6ab +3b²-120² 3)x²(x-1) + 16(1-x) 4)a² + 2ab + b²-ac-be 5)xz-yz-x² + 2xy-y² 6)

Toán Lớp 8: Phân tích đa thức thành nhân tử
1)x² – 2x – 4y²-4y
2)3a²-6ab +3b²-120²
3)x²(x-1) + 16(1-x)
4)a² + 2ab + b²-ac-be
5)xz-yz-x² + 2xy-y²
6)2x +2y-x²-xy
Cần gấp ạ

Comments ( 1 )

  1. 1, x^2-2x-4y^2-4y
    =(x^2-4y^2)-(2x+4y)
    =(x-2y)(x+2y)-2(x+2y)
    =(x+2y)(x-2y-2)
    2, 3a^2-6ab+3b^2-120
    -> \text{Sửa đề:}3a^2-6ab+3b^2-12
    =3(a^2-2ab+b^2-4)
    =3[(a-b)^2-2^2]
    =3(a-b-2)(a-b+2)
    3, x^2(x-1)+16(1-x)
    =x^2(x-1)-16(x-1)
    =(x-1)(x^2-16)
    =(x-1)(x-4)(x+4)
    4, a^2+2ab+b^2-ac-be
    -> \text{Sửa đề:} a^2+2ab+b^2-ac-bc
    =(a+b)^2-c(a+b)
    =(a+b)(a+b-c)
    5, xz-yz-x^2+2xy-y^2
    =z(x-y)-(x^2-2xy+y^2)
    =z(x-y)-(x-y)^2
    =(x-y)(z-x+y)
    6, 2x+2y-x^2-xy
    =2(x+y)-x(x+y)
    =(x+y)(2-x)

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