r=52160(9)\r28-1S\r : 320*15+12=400(7)\r2 9 -1 , 3;<=4007.\r( : 4500x (1- 4 ) = 2500 ( > )\r9\r3 0 -1 .? @ M2500>ABCD.\rlm=100cm\r3.14x (20+2 ) 2 xl00=31400(cm3)\r31-1E S $ ^ f i W $ 3 1 4 0 0 5 F\r 1 4 1 5 .\r 3.14x20xl00-s-2+3.14x ( 20+2)2=3454(cm2)\r31-2D 0@P`p?\r?3454?.\rY Z [ \ ] ^ > _ ]\r`a`b 1 + ( G +G )\rc Z [ \ ] d > _ e 14-10\rfg8h)b\r6000+ I 2\rY DciZj]` >_ 6000 + (6000 + 1 0\r]klmnob 4-6000-5-12)\r32-Is\rG p?qrA0( 8 ) ( 3 IJ 8 )\r11 4\r4\r33_ 1D 2\r150\r215\r33-2. 350\r33-3 1\r34-1. A\r120\r240\r37.5\r35-1 > 415\r 15 15