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U8+U9 = 8²+2.8 + 9²+2.9 = 64+16 + 81 + 18 = 80 + 99 = 179
Jadi jumlah U8 dan U9 adalah 179
U₈=(8)²+2(8)
U₈=64+16
U₈=80
U₉=(9)²+2(9)
U₉=81+18
U₉=99
U₈+U₉=80+99
U₈+U₉=179
:3 hehehe