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a2(a2-a3)+a3(a2-a3)
= a2-a3+2-a6
2-a6+a6-a9
= a2-a3+2-a6
2-3
= a2-a3+2-a6
-1
=-a2+a3-2+a6
=-2-a2+a3+a6
a itu akar..
=
=