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u1= 2.1 = 2
u2= 2.2 = 4
u3= 2.3 = 6
u4= 2.4 = 8
jika u100
u100= 2.100 = 200
u1 = a1+b=2 =a+b=2
u2 = a2+b=4 =2a+b=4
_______ _
-a = -2
a=-2/-1= 2
a+b=2
2+b = 2
b = 2-2=0
u100=2 dikali 100 + 0
u100 = 200 + 0
u100 = 200