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

Toán Lớp 8: 1+4x – y ^2 + 4x^2 phan tich da thuc thanh nhan tu

Toán Lớp 8: 1+4x – y ^2 + 4x^2
phan tich da thuc thanh nhan tu

Comments ( 2 )

  1. $\text{1 + 4x – $y^{2}$ + 4$x^{2}$ }$
    $\text{= $1^{2}$ + 2.1.2x + (2x$)^{2}$ }$ 
    $\text{= (1 + 2x$)^{2}$ – $y^{2}$ }$
    $\text{= ( 1 + 2x – y )(1 + 2x + y)}$

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