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

Toán Lớp 8: Đề bài: Tính a) (4x+7)^2 b) (6x- 1/3y)^2 c) (3x^2 -5xy^3) (3x^2 + 5xy^3)

Tháng Hai 7, 2023 Toán học 2 Comments 0 views

Toán Lớp 8: Đề bài: Tính
a) (4x+7)^2
b) (6x- 1/3y)^2
c) (3x^2 -5xy^3) (3x^2 + 5xy^3)

Comments ( 2 )

  1. daolanhoa
    daolanhoa
    7 Tháng Hai, 2023 at 10:50 chiều
    Reply
    a. $(4x+7)^2\\=(4x)^2+2.4x.7+7^2\\=16x^2+56x+49$
    b. $\left(6x-\dfrac13y\right)^2\\=(6x)^2-2.6x.\dfrac13y+\left(\dfrac13y\right)^2\\=36x^2-4xy+\dfrac19y^2$
    c. $(3x^2 -5xy^3) (3x^2 + 5xy^3)\\=(3x^2)^2-(5xy^3)^2\\=9x^4-25x^2y^6$

  2. ngocbichchau
    ngocbichchau
    7 Tháng Hai, 2023 at 10:49 chiều
    Reply
    ~rai~
    \(a)(4x+7)^2\\=(4x)^2+2.4x.7+7^2\\=16x^2+56x+49.\\b)\left(6x-\dfrac{1}{3}y\right)^2\\=(6x)^2-2.6x.\dfrac{1}{3}y+\left(\dfrac{1}{3}y\right)^2\\=36x^2-4xy+\dfrac{1}{9}y^2.\\c)(3x^2-5xy^3)(3x^2+5xy^3)\\=(3x^2)^2-(5xy^3)^2\\=9x^4-25x^2y^6.\)

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

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