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

Toán Lớp 8: Phan thuc da thuc thanh nhan tu y^2-4y+4 x^2+2x-3

Toán Lớp 8: Phan thuc da thuc thanh nhan tu
y^2-4y+4
x^2+2x-3

Comments ( 2 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
    y^2-4y+4
    =y^2-2.y.2+2^2
    =(y-2)^2
    x^2+2x-3
    =x^2+3x-x-3
    =(x^2+3x)-(x+3)
    =x(x+3)-(x+3)
    =(x+3)(x-1)
    $\text{#LinhSad}$

  2. $\text{$y^{2}$ – 4y + 4}$
    $\text{=$y^{2}$ . y . 2 +$2^{2}$ }$
    $\text{= ( y – 2$)^{2}$ }$
    $\text{, $x^{2}$ + 2x – 3}$
    $\text{= $x^{2}$  + 3x – x – 3}$
    $\text{=x (x+3) – (x-3)}$
    $\text{= ( x + 3 )( x – 1 )}$

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

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