(2a-b-3c)(-2a-b+3c)

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(2a-b-3c)(-2a-b+3c)
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(2a-b-3c)(-2a-b+3c)
(2a-b-3c)(-2a-b+3c)

(2a-b-3c)(-2a-b+3c)
原式=[(2a-3c)-b]*{-[(2a-3c)+b]}
=-[(2a-3c)-b]*[(2a-3c)+b]
=-[(2a-3c)²-b²]
=-(4a²-12ac+9c²-b²)
=-4a²+12ac-9c²+b²

(2a-b-3c)(-2a-b+3c)
=-(2a-b-3c)(2a+b-3c)
=-[2b-b-(2a-+b)-3c]
=-(2a-b-2a-b-3c)
=-(-2b-3c)
=2b+3c

(2a-b-3c)(-2a-b+3c)
=-(2a-b-3c)(2a+b-3c)
=-[(2a-3c)-b][(2a-3c)+b]
=-[(2a-3c)²-b²]
=-(2a-3c)²+b²

(2a-b-3c)(-2a-b+3c)
=[-b+(2a-3c)][-b-(2a-3c)]
=(-b)^2-(2a-3c)^2
=b^2-(4a^2-12ac+9c^2)
=b^2-4a^2+12ac-9c^2

=-4a^2-2ab+6ac+2ab+b^2-3bc+6ac+3bc-9c^2
=-4a^2+b^2-9c^2+12ac