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

Toán Lớp 7: (a²+1)² -4a² X² – 3x²+4x+12 x4+x2+x+1 x4+x³+x²+1 (2x+1)²+(x+1)² x4+4x²+5

Toán Lớp 7: (a²+1)² -4a²
X² – 3x²+4x+12
x4+x2+x+1
x4+x³+x²+1
(2x+1)²+(x+1)²
x4+4x²+5

Comments ( 1 )

  1. ($a+1)^{2}$ -$4a^{2}$ 
    =($a^{2}$+1-2a)(a41+2a)
    =($a^{2}$-a2+1)( $a^{2}$+2a+1)
     

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

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