... x' x ' + 0,8 Suy X= 0,8(0,8 + x) x(0,8 + x) = (1 ) v Y = = (2 ) (1 - 0, 8)( a - 0,8 - x) (3 - x)(a - 0,8 - x) Chia v theo v (1 ') v (2 '), suy c c = 1,92 Thay vo (1 ') suy a = 9,97 Bi 50 ... 14m) + 0,15.58,5 = 62, 775 ( 3) ù x + y + z = 0, (3 ') ợ ù ợ T ( 2) v ( 3) suy 17 36( x + y ) < 16 + z < 38( x + y ) 36(0, - z ) < 16 + z < 38(0, - z ) < z < ( *) 15 110 ỡ y = 3, - 22 z T ( 2) v ( 3) ... nguyờn t ca gc R) m = x.( M + 7 1) + x.( M + 8 5) ( 1) (Khi lng este) x.44 + x.58 = m - 12, ( 2) (Khi lng andehit) (83 + M ). 5 x + (0, - x).56 = m + 6, ( 3) (chỳ ý lng rn ú cú KOH d) T ú suy ra: x...