7 2001 2001 2001 2001 2001 - 2001\r; <EFGx1H.\r9 x\r2 = =\rx=21\r28T J <FG21K.\r29T L\r29-2 L\r; 1 1 < = 1 3 <.\r29-3 5 5 cm2\r-9 B C Y (= 2 FG= 10?)\r30T \r=3.14x16 - 3.14x9\r=3.14x (16 - 9 )\r=3.14x7\r=21.98 ( cm2 ) ;\r31-1 J <NO08PQRST21.98cm2\r[9 \]^F(=5 FG= 32?)\r32-1 ;`p\r?153\r33-1 ?242.4\r; <240+4=60(O)\r34-1 , J <WXY60OZ>.\r : , SH-HSiha+l, [ 16 - 2a ,\r\ ] ^ _ 75ei00a+10 ( a+1) +16 - 2a - 100 (16 - 2a ) - ( 10a+l) - a=198,\r`aa=6 , ba+ 1=7,16 - 2a=4 ;\r35-1 J <c?d476 .\r; 12< = 13<.\r36-1, 9750\r36-29 1057\r36-39 1 5 7 0\r; 1 3 < = 1 3 <
全文预览