х³у²-х³-ху²+х= (х³у²-х³) -(ху²-х) = х³(у²-1) - х(у²-1) =(у²-1) (х³-х) =
=(у-1)(у+1)(х²-1)х = х(х-1)(х+1)(у-1)(у+1)
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х³у²-х³-ху²+х= (х³у²-х³) -(ху²-х) = х³(у²-1) - х(у²-1) =(у²-1) (х³-х) =
=(у-1)(у+1)(х²-1)х = х(х-1)(х+1)(у-1)(у+1)