... 4g1ivQtr: K6t qu6 rut ggn c0a bi6u ,nr" ( 52 61 1-1 ^ 62 + , 62 2 .61 2. 104 ffi - 12 =6 1 52^ ) lo 9 12. 960 3 cht^wng ngqi vQt B: " *, "o BCNN c0a tir s6 vdr m5u s6 bdng 36Q ld: 20 ' o 18 36 u._ D B." 40 20 80 ... Oa.L,L,J24' ,24 ' ,24 9, 4 ,21 15 .21 o o 24 '24 ' .24 24 ' ,24 '24 33 Oo _, vdi mdu s6 chung la 24 thi duqc C n 19, 2! ,4 Oc td: oc.-1 10 24 ' ,24 ' ,24 Cho doAn thing AB = 4cm, I lii trung di6m c0a AB Tr6n tia Bl, t6y ... vcri ;, ti6p tr;c 5', A nh6n voi ! thidwoc 224 s6 oa cho td 56 frqc sinh gi6i crla kh6i 6la 118 em, chi6m kh6i 56 hqc sinh c0a kh6i 6la em BiCt25% crla mQt s6 Oang 4 ,24 S6 d6 la (vi6t k€t qud...