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U5 = a+4b = 2,4 -
-4b = -1,2
b = 0,3
S5 = 5/2 (2.1,2+ 4b)
= 2,5 (2,4+ 4.0,3)
= 2,5 (3,6)
= 9 m
2,4 = 1,2 + 4. b
1,2 = 4b
b = 0,3
sn = n/2 (2a + (n-1)b))
s5 = 5/2(2.1,2 + 4. 0,3)
s5 = 9 m