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S1 = 3.1² - 5.1
= 3 - 5 = -2
S2 = 3.2² - 5.2
= 3.4 - 10
= 12 - 10
= 2
S1 = U1 = a = -2
S2 = U1 + U2
U2 = S2 - U1
= 2 - (-2) = 4
beda = U2 - U1 = 4 - (-2) = 6
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