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U10 = 20 - 100
U10 = -80
U11 = 2(11) - 11²
U11 = 22 - 121
U11 = -99
jumlahkan
U10 + U11
-80 + -99
-179
=20 - 100
=-80
U(11) = 2×11 - 11^2
=22 - 121
=-99