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U1 = 3.1 - 5 = 3-5= -2
U2 = 3.2 - 5= 6 - 5= 1
U3 = 9 - 5 = 4
U4 = 7
U5 = 10
H. Un = n(n+1)
U1 = 1(1+1) = 1.2 = 2
U2 = 2(2+1) = 2.3 = 6
U3 = 3(3+1) = 3.4 = 12
U4 = 4.5 = 20
U5 = 5.6 = 30
J Un = (n+1)(n-3)
U1 = (1+1)(1-3)= 2.-2 = -4
U2 = (3.-1) = -3
U3 = 4.0=0
U4 = 5.1 = 5