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9 m
U5 = a + 4b
1,2 + 4b = 2,4
4b = 1,2
b = 0,3
S5= 5/2 (2(1,2) + 4(0,3))
= 5/2 (2,4 + 1,2)
= 5/2 (3,6)
= 9 m