11 21\r- 20 20\r11 20\r= 20x 2T\r11\r21\rB (? C D EFGHIJE11 .\r27-3!\rf! g h 6 ?5 2 675 7 \r28-1!K (LMNO,QRESTUGLMOEVW.\r29-1.\r29-2! )*1+,15.7\r! 6 ?5 28 ?5 4 675 2 2 \r:714+70%=1020Y )\r30-1!B ([\]^_E`aG102b .\r; :1020xl.5%x ( 30-20) =153Y )\r30-2, B:cdEeefgh153ijklmS.\r; : (445+714+153) (1- 1 )=1476b )\r30-3!B (noJRMpqrst1476i.\r> 1 2 ? 5 1 3 ?.\r; :3.14xl0x20+3.14x (10+2 )\r= 628^3.14x25x2\r= 628+157\r:785 ( v w " )\r3 1 -1 .? (IB9W SW 785vw?.\r: 1 3,14x (2+2 ) 2*3.3.14* (2+2 ) 2*4\r= -i x3.14x1x3+3.14x1x4\r= 3.14+12.56\r= 15.7 ( ywfig )\r3 1 -2 .z ({1*O0R15.7| }\rB (~ptE ;E3 .\r32-1 8 8\r3 3 T (2*2=4\r> 1 3 ? 5 1 3 ?
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