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kubus = 6.s
= 6 . 12 x 12
= 864
balok = 2(p x t) + 2(p x l) + 2(t x l)
= 2(7 x 5) + 2(7 x12) + 2(5 x 12)
= 70+168+120
= 358
lp kubus + lp balok = 864 + 358
= 1222 (a)