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258 =2((9.5)+9t+5t))
258 = 2(45+9t+5t)
258 = 90+18t+10t
258 =90+28t
258-90 =28t
168 = 28t
= t
6 = t
V balok = plt
= 9.5.6
Vbalok = 270
258 = 2.9.5 + 2.9.t + 2.5.t
258 = 90 + 18t + 10t
258 = 90 + 28t
28t = 258 - 90
28t = 168
t = 168 : 28
t = 6 cm
Volume balok = p.l.t
= 9.5.6
= 270 cm3