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

Toán Lớp 8: khai triển biểu thức : (x+2y-1)^2

Toán Lớp 8: khai triển biểu thức :
(x+2y-1)^2

Comments ( 2 )

  1. (x+2y-1)^2
    = (x+2y-1)(x+2y-1)
    = x^2+2xy-x+2xy+4y^2-2y-x-2y+1
    = x^2+4xy-2x+4y^2-4y+1
    $\text {@lamtung2007}$
     

  2. Giải đáp:
    (x+2y-1)^2
    =(x+2y)^2-2.(x+2y)+1
    =x^2+2x.2y+4y^2-2(x+2y)+1
    =x^2+4xy+4y^2-2x-4y+1

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