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U7 = 7² + 3(7)
U7 = 49 + 21
U7 = 70
U5 = 5² + 3(5)
U5 = 25 + 15
U5 = 40
maka
U7 - U5
= 70 - 40
= 30
Jawaban A
U7 - U5 ?