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

Toán Lớp 8: g) x^2 + 7xy + 10y^2 h) x^2 − 6xy + 5y^2 i) a^2 − 7ab + 12b^3 j) x^2 − x − 6 l) x^3 − 19x − 30

Tháng Mười Một 5, 2022 Toán học 1 Comment 0 views

Toán Lớp 8: g) x^2 + 7xy + 10y^2
h) x^2 − 6xy + 5y^2
i) a^2 − 7ab + 12b^3
j) x^2 − x − 6
l) x^3 − 19x − 30

Comments ( 1 )

  1. truonganhthi
    truonganhthi
    5 Tháng Mười Một, 2022 at 12:45 chiều
    Reply
    g) x^2+7xy+10y^2
    =x^2+2xy+5xy+10y^2
    =x(x+2y)+5y(x+2y)
    =(x+2y)(x+5y)
    h) x^2-6xy+5y^2
    =x^2-xy-5xy+5y^2
    =x(x-y)-5y(x-y)
    =(x-y)(x-5y)
    i) Sửa đề: a^2-7ab+12b^2
    =a^2-3ab-4ab+12b^2
    =a(a-3b)-4b(a-3b)
    =(a-3b)(a-4b)
    j) x^2-x-6
    =x^2+2x-3x-6
    =x(x+2)-3(x+2)
    =(x+2)(x-3)
    l) x^3-19x-30
    =x^3+2x^2-2x^2-4x-15x-30
    =x^2(x+2)-2x(x+2)-15(x+2)
    =(x+2)(x^2-2x-15)
    =(x+2)(x+3x-5x-15)
    =(x+2)[x(x+3)-5(x+3)]
    =(x+2)(x+3)(x-5)

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

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