C,vAsAO rAo * HQI TOAH HQC VIET NAM {r l, l i 1 L = r! i r )alata)aDai 4{}a} 4jelrlrprr+l*l 1j*5^ira a, d, * *D ,* 1*+4r+r trta{} 1 G g = ,t ffi d iit 'ffi , + , rli Ii "+ 'r;!i ;tff, ti s*i ,l "ffi @r' ffi , ,,, ,' '; 1 ili ; t '! ( 4i*""$il , ;iF,i I# MKKOx = = hav MP KP ' R x G r R = 0 61ttOR 2 B !ll r DTJNC NCU CIAC ETU KP = x (h 1) Ta c6 LKMP u, LQKP R ' e xz + Rr R2 = 0 = x =x /5n R 22 Hinh 2 Ta se chgn mdt m[ lA 16 ^0 rlmg vdi 16 sd khdc nhau bdt ki trong hinh vuOng MNPQ Dd kh6a mar ma kh[.]