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"maaf kalau salah....."
Kalau maksudnya
p - 2p - 4r + 3p + 5q - 5r
p + 3p - 2p - 4r - 5r + 5q
4p - 2p - 9r + 5q
Hasilnya : 2p - 9r + 5q
Kalau maksudnya
(p - 2p - 4r) + (3p + 5q - 5r)
p (3p + 5q - 5r) - 2p (3p + 5q - 5r) - 4r (3p + 5q - 5r)
3p kuadrat + 5qp - 5rp - 6p kuadrat - 10qp + 10rp - 12rp - 20rq + 20r kuadrat
3p kuadrat - 6p kuadrat + 5qp - 10qp - 5rp + 10rp - 12rp - 20rq + 20r kuadrat
Hasilnya : -3p kuadrat - 5qp - 7rp - 20rq + 20r kuadrat