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

Toán Lớp 8: (2x + y)^2 – (2x + y) (2x – y) + y(x – y)

Home/ Toán Lớp 8: (2x + y)^2 – (2x + y) (2x – y) + y(x – y)

Toán Lớp 8: (2x + y)^2 – (2x + y) (2x – y) + y(x – y)

Tháng Tám 3, 2022 Toán học 2 Comments 0 views

Toán Lớp 8: (2x + y)^2 – (2x + y) (2x – y) + y(x – y)

Comments ( 2 )

  1. kimoanh34
    kimoanh34
    3 Tháng Tám, 2022 at 8:17 chiều
    Reply
    $(2x + y)^{2}$ – (2x + y) (2x – y) + y(x – y)
    ⇒$(2x + y)^{2}$ – ($(2x)^{2}$-$y^{2}$) + y(x – y)
    ⇒$(2x + y)^{2}$ – $(2x)^{2}$+$y^{2}$ + y(x – y)
    ⇒$(2x)^{2}$+4xy+$y^{2}$-$4x^{2}+$y^{2}+xy-$y^{2}$
    ⇒$4x^{2}$+4xy+$y^{2}$-$4x^{2}+$y^{2}+xy-$y^{2}$
    ⇒($4x^{2}$-$4x^{2})+($y^{2}$-$y^{2)$}+(4xy+xy)+$y^{2}$
    ⇒5xy+$y^{2}$

  2. truongthanhhung
    truongthanhhung
    3 Tháng Tám, 2022 at 8:17 chiều
    Reply

    Đây
    toan-lop-8-2-y-2-2-y-2-y-y-y

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

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