Odpowiedź:
-p•(-2)r+3p•(-2pr)+2r•(-p)-p²•(-4r)=
=2pr-6p²r-2pr+4p²r=-2p²r
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Odpowiedź:
-p•(-2)r+3p•(-2pr)+2r•(-p)-p²•(-4r)=
=2pr-6p²r-2pr+4p²r=-2p²r