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= 5
U3 = a + 2.b
12= a +2.5
a =12-10 =2
(37-12) :5 =
25 : 5 = 5
S30 = 30/2 (2.2 + (30-1) 5)
= 15 (4 + 145 )
= 15 . 149
= 2235