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Nomor 2 & 3
Nomor 2 & 3
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= (a - 2b)(x - 2y) + (2b - a)(x - y)
= (a - 2b)(x - 2y) + (a - 2b) (y - x)
= (a - 2b) (x - 2y + y - x)
= (a - 2b) (-y)
No 3
= 3x^2 (x - 2y)^2 + 9xy^2 (2y - x)
= 3x^2 (x - 2y)(x - 2y) - 9xy^2 (x - 2y)
= (x - 2y) ( 3x(x - 2y) - 9xy^2)
= (x - 2y) (3x^2 - 6xy - 9xy^2)