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6a4b2c2−3a2b2+(−2ac)2−(−ac)(−7ac)=
=−2a4−2b2−2c2+4a2c2−7a2c2=
=−2a2b0c2+4a2c2−7a2c2=
=−2a2c2+4a2c2−7a2c2=
=(−2+4−7)a2c2=
=−5a2c2
@gramor
@remanzini_rinaldo - Grazie mille, buona giornata.
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