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selisih kuadrat
(5pq - 3r) ( 5pq + 3r)
nomer 2
slisih kuadrat
(a + b - c) ( a + b + c)
nomer 3
pemfaktoran
x² + 3xy - 10 y²
(x² -2xy ) + ( 5xy - 10 y²)
x ( x - 2y) + 5y ( x - 2y)
(x + 5y) ( x - 2y)