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

Toán Lớp 8: b,(x^2+x-4)(x^2-x+4) c,(9x^4x^2+4x-1):(3x^2+1-2x)

Toán Lớp 8: b,(x^2+x-4)(x^2-x+4)
c,(9x^4x^2+4x-1):(3x^2+1-2x)

Comments ( 2 )

  1. $@Mốc$
    b, $(x^{2} + x – 4)$.$(x^{2} – x + 4)$
    =    $x^{4}$ – $(x – 4)^{2}$
    =    $x^{4}$ – $x^{2}$ + $8x$ – $16$
    c, $(9x^{4}.x^{2} + 4x – 1):(3x^{2}+1-2x)$ 
    = $(9x^{6} + 4x – 1):(3x^{2}-2x+1)$
    Theo như mk chia á nó ra thương là $3x^{2}$ + $2x^{2}$ dư $x^{3}-2x^{2} + 4x-1$
    Không bt đúng nx ‘-‘)
    $#chucbanhoctotnhe;333$ 

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