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b. 2x2+3xy+3x-2y2+6y
jadikan jawaban tercerdas ya
= a^2-ab+ab-b^2
=a^2-b^2
b.(x+2y) (2x-y+3)
= 2x^2-xy+3x+4xy-2y^2+6y
=2x^2+3x-2y^2+6y+3xy