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maka
soal equivalen dengan
[(p² + r²)/q²] - 1
= [((2q)² + ((2p + q)/5)²)/q²] - 1
= 4q²/q² + ((4p² + 4pq + q²)/25q²) - 1
= 3 + [(4(4q²) + 4(2q)q + q²)/25q²]
= 3 + (16q² + 8q² + q²)/25q²
= 3 + 25q²/25q²
= 3 + 1
= 4