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U1 = 5.1 - 7 = -2
U5 = 5.5 - 7 = 18
u1+u5 = -2+18=16
2. Un =2n²-5
U4 = 2.4²-5
U4 = 2.16 - 5
U4 = 27
U5 = 2.5² - 5
= 2.25 -5
= 45
U4 + U5 = 27 + 45 = 72
maav kalo salah :))