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

Toán Lớp 8: PTĐTTNT: a) x^2+4x+4 b) x^2+8x+16

Toán Lớp 8: PTĐTTNT:
a) x^2+4x+4
b) x^2+8x+16

Comments ( 2 )

  1. $a) x^2+4x+4$
    Cách 1:$=x^2+2.2.x+2^2$
               $=(x+2)^2$
    Cách 2:Áp dụng $HĐT$ số $1$ ta có: $x^2+4x+4=(x+2)^2$
    $b) x^2+8x+16$
    Cách 1:$=x^2+2.4.x+4^2$
               $=(x+4)^2$
    Cách 2:Áp dụng $HĐT$ số $1$ ta có: $x^2+8x+16=(x+4)^2$

  2. $a)x^2+4x+4$
    $=(x+2)^2$
    $b)x^2+8x+16$
    $=(x+4)^2$
    $#thanhmaii2008$
     

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