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

Toán Lớp 8: 1)3x³+6x²+3x-12x² 2)a³-ab³+a²+2ab+b² 3)(x²-9y²)-(4x+12y) 4)(x²-16y²)-3x+12y

Tháng Một 19, 2023 Toán học 1 Comment 0 views

Toán Lớp 8: 1)3x³+6x²+3x-12x²
2)a³-ab³+a²+2ab+b²
3)(x²-9y²)-(4x+12y)
4)(x²-16y²)-3x+12y

Comments ( 1 )

  1. cattien
    cattien
    19 Tháng Một, 2023 at 12:42 sáng
    Reply
    1)3x^3+6x^2+3x-12x^2
    =3x^3+(6x^2-12x^2)+3x
    =3x^3-6x^2+3x
    =3x(x^2-2x+1)
    2)a^3b-ab^3+a^2+2ab+b^2
    =a^3b-ab^3+(a^3+2ab+b^2)
    =ab(a^2-b^2)+(a+b)^2
    =ab(a-b)(a+b)+(a+b)(a+b)
    =(a+b)[ab(a-b)+(a+b)]
    =(a+b)(a^2b-ab^2+a+b)
    3)(x^2-9y^2)-(4x+12y)
    =[x^2-(3y)^2]-4(x+3y)
    =(x+3y)(x-3y)-4(x+3y)
    =(x+3y)(x-3y-4)
    4)(x^2-16y^2)-3x+12y
    =[x^2-(4y)^2]-(3x-12y)
    =(x-4y)(x+4y)-3(x-4y)
    =(x-4y)(x+4y-3)
    $\text{@ThanhTruc2008}$

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

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