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

Toán Lớp 8: bài 1:ptdt thành nhân tứ:x^2+8x-y^2-1

Toán Lớp 8: bài 1:ptdt thành nhân tứ:x^2+8x-y^2-1

Comments ( 2 )

  1. x^2+8x-y^2+16
    =x^2+8x+16-y^2
    =(x+4)^2-y^2
    =(x+4-y)(x+y+4)
     

  2. x^2+8x+16-y^2
    =(x^2+8x+16)-y^2
    =(x+4)^2-y^2
    =(x+4-y)(x+4+y)
     

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

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