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,2, , , .,3,: , = ,S = ah2, S = ah, = 2,4,., ,5,S = (a +b) h 2, , ., , + , , , + , ,6, , ,.,7, , , ,8, , , ,9, , , ,10, , , ,11,12,S=(a+b)h2,=(36+120)1352 =1561352 =10530(m2), () ,13, ,14,。, 8 1 ,15, () 2.8 1.4 1.2 . ,