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B. U10 = 21
S10 = 255
pilih jadi solusi terbaik ya gan
S1= 3(1) kuadrat -5(1)+5
S1= 3-5+5
S1= 3= U1
S2= U1+ U2
3(2) kuadrat - 5(2) + 5=3+U2
7=3+U7
U7=4
b=U2-U1= 4-3=1
jadi bedanya adalah 1
B. U10= S10-S9
S10= 3.10 kuadrat-5(10) +5
= 300-50+5 = 255
S9= 3.9 kuadrat- 5(9) +5
= 3.81 -45+5
=243-40=203
U10= S10-S9=255-203=52
semoga membantu ya!:)