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3+√5 x 3-√5
3-√5 3-√5
9-25
9-6√5+25
di dekatkan aja supaya mudah
9-25
9+25-6√5
catatan
-1-6√5=-7√5yang 9-25 per 9+25= -1
Semoga membantu ya , dan maaf klo slah :))