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

Toán Lớp 8: 1. 4x ² – 9y ² + 5xy 2. x ² – 2x – 4y ² – 4y

Home/ Toán Lớp 8: 1. 4x ² – 9y ² + 5xy 2. x ² – 2x – 4y ² – 4y

Toán Lớp 8: 1. 4x ² – 9y ² + 5xy 2. x ² – 2x – 4y ² – 4y

Tháng Tám 13, 2022 Toán học 1 Comment 0 views

Toán Lớp 8: 1. 4x ² – 9y ² + 5xy
2. x ² – 2x – 4y ² – 4y

Comments ( 1 )

  1. lanngocha
    lanngocha
    13 Tháng Tám, 2022 at 10:45 chiều
    Reply
    #tnvt
    4x^2-9y^2+5xy
    =4x^2+5xy-9y^2
    =4x^2-4xy+9xy-9y^2
    =4x(x-y)+9y(x-y)
    =(x-y)(4x+9y)
    x^2-2x-4y^2-4y
    =x^2-2x+1-4y^2-4y-1
    =(x^2-2x+1)-(4y^2+4y+1)
    =(x-1)^2-(2y+1)^2
    =(x-1-2y-1)(x-1+2y+1)
    =(x-2y-2)(x+2y)

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

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