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

Toán Lớp 8: a) x ( x + y ) + 4x + 4y b) x ² – 2xy – 4 + y ²

Toán Lớp 8: a) x ( x + y ) + 4x + 4y
b) x ² – 2xy – 4 + y ²

Comments ( 2 )

  1. Giải đáp:
    $\text{a/ (x + 4)(x + y) ; b/ (x – y + 2)(x – y – 2)}$ 
    Lời giải và giải thích chi tiết:
    $\text{a/ x(x + y) + 4x + 4y }$ $\\$ $\text{= x(x + y) + 4(x + y)}$ $\\$ $\text{= (x + 4)(x + y)}$ $\\$ $\text{b/ x² – 2xy – 4 + y²}$ $\\$ $\text{= (x² – 2xy + y²) – 4}$ $\\$ $\text{= (x – y)² – 2²}$ $\\$ $\text{= (x – y + 2)(x – y – 2)}$.

  2. $\text{a, x(x + y) + 4x + 4y}$
    $\text{= x(x + y) + (4x + 4y)}$
    $\text{= x(x + y) + 4(x + y)}$
    $\text{= (x + 4)(x + y)}$
    $\text{b, x² – 2xy – 4 + y²}$
    $\text{= (x² – 2xy + y²) – 2²}$
    $\text{= (x – y)² – 2²}$
    $\text{= (x – y – 2)(x – y + 2)}$

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

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