h_fi\r : 12-r (8-5) =4 ()\r8x4+5x4+12=64 (=)\rm 8x4x2=64 (=)\rh_f 4 PnoNhp64=[\r47"#1 q : 2 qr7@st@Pu@\rvwx612VDP? 6 18VDy.6z\r{|W}VD\r12: 18|W}VD636\r6 @+36=6@ 36\rr7@st@6~6 @ 36\r48"#"o 6 (45-15)p ,
\r6o11V@P<=6o\r(11-1) V P$2o?@P
6o\r 11V ??o15P =D.6u\rR\r (45-15) -r (11-1) =3 ()\r15-3=12 ()\r12
6o11V .\r49"#RSPFR/\r2 7"3 7"4 7"5 7\r? , P22"3"4"5 |W}VDB1 .6\rR\r2"3"4"5 |W}VD660\r60-1=59 (¡)\r<n¢£|p59¡\r50"#&'¤)*8\rP,-.)*4 0 /0\rP234/Y¥¦>§&'§)*5\r,\r,-.)*40/0\rP234/Y¥¦>¤\rA34¤¨F34§.6 ,-\r (404-5) x (404-8) =40 (/0\r)\r/Y¥¦>©34,-64 0 /0\r