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全全 海海 小小 学学ZhuLinprimaryschoolZhuLinprimaryschool s = a h = 全全 海海 小小 学学ZhuLinprimaryschoolZhuLinprimaryschool s = a h 2 = 2 + = 2 S = (a + b)h 2: )= + (2 :例题 336m120m135m s = (a + b ) h 2=(36+120)1352=1561352 = 10530(m )2 )( 10530 40cm40cm45cm45cm71cm71cm65cm65cm40cm40cm - 2.22.25 53.43.4 ) (100mm100mm250mm250mm48mm48mm- ) ( 。 15m )( 65