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

Toán Lớp 8: a)(7x+4)^2-(7x+4)(7x-4) b)(x+2y)^3-6xy(x+2y)

Home/ Toán Lớp 8: a)(7x+4)^2-(7x+4)(7x-4) b)(x+2y)^3-6xy(x+2y)

Toán Lớp 8: a)(7x+4)^2-(7x+4)(7x-4) b)(x+2y)^3-6xy(x+2y)

Tháng Bảy 28, 2022 Toán học 2 Comments 0 views

Toán Lớp 8: a)(7x+4)^2-(7x+4)(7x-4)
b)(x+2y)^3-6xy(x+2y)

Comments ( 2 )

  1. ngoclanhoa
    ngoclanhoa
    28 Tháng Bảy, 2022 at 10:25 chiều
    Reply
    a) (7x+4)^2-(7x+4)(7x-4)
    =49x^2+56x+16-49x^2+16
    =(49x^2-49x^2)56x+(16+16)
    =56x+32
    b) (x+2y)^3-6xy(x+2y)
    =x^3+6x^2y+12xy^2+8y^3-6x^2y-12xy^2
    =x^3+(6x^2y-6x^2y)+(12xy^2-12xy^2)+8y^3
    =x^3+8y^3
     

  2. hothaibinh
    hothaibinh
    28 Tháng Bảy, 2022 at 10:25 chiều
    Reply
    a, (7x+4)^2-(7x+4)(7x-4)
    =49x^2+56x+16-49x^2+16
    =56x+32
    b, (x+2y)^3-6xy.(x+2y)
    =x^3+6x^2y+12xy^2+8y^3-6x^2y-12xy^2
    =x^3+8y^3
    Cho mk xin hay nhất please
    Thank you

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

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