1原式=-(2a3-3b2)(2a3-3b2)=-(2a3-3b2)2=-4a6+12a3b2-9b4
2原式=(c+(3a-2b))(c-(3a-2b))=c2-(3a-2b)2=c2-9a2+4b2
3、原式=(a2-4b2)(a2+4b2+2ab)(a2+4b2-2ab)
=(a2-4b2)[(a2+4b2)2-4a2b2]
=(a2-4b2)(a2+4b2)2-(a2-4b2)4a2b2
=(a4-16b4)(a2+4b2)-4a4b2+16a2b4
=a6+4a4b2-16a2b4-64b6-4a4b2+16a2b4
=a6-64b6