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U1=2x1-5 = 2-5 = -3
U2 = 2x2 - 5 = 4-5 = -1
U3 = 2x 3 -5 = 6 - 5 =1
maka
-3,-1,1
= 2-5
= -3
U2 = 2(2) -5
= 4-5
= -1
U3 = 2(3) -5
= 6-5
= 1
S3 = -3+(-1)+1
=-3