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u1=7.1-5=2
u2=7.2-5=9
u3=7.3-5=16
u4=7.4-5=23
u5=7.5-5=30
un=5n²-2
u1=5.1²-2=3
u2=5.2²-2=18
U3=5.3²-2=43
u4=5.4²-2=78
u5=5.5²-2=123
maaf kalau ada yg salah