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

Toán Lớp 8: Thực hiện phép tính: (2x+3y)^2

Toán Lớp 8: Thực hiện phép tính: (2x+3y)^2

Comments ( 2 )

  1. (2x+3y)^2
    =(2x)^2 + 2.2x.3y+(3y)^2
    =4x^2+12xy+9y^2
    Áp dụng
    (A+B)^2=A^2+2AB+B^2

  2. (2x+3y)^2
    =(2x)^2-2.2x.3y+(3y)^2
    =4x^2-12xy+9y^2
    @thew

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

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