(х-1)(х+1)+(х-3)(х+1)=(х+1)(x-1+x-3)=(x+1)(2x-4)=(x+1)×2(x-2)=2(x+1)(x-2)
(3х-1)²+(х+2)(3х-1)=(3x-1)(3x-1+x+2)=(3x-1)(4x+1)
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(х-1)(х+1)+(х-3)(х+1)=(х+1)(x-1+x-3)=(x+1)(2x-4)=(x+1)×2(x-2)=2(x+1)(x-2)
(3х-1)²+(х+2)(3х-1)=(3x-1)(3x-1+x+2)=(3x-1)(4x+1)