... = 9, 3 (2 2) 2 6( 01)x x x HVKTQS+ = + + 10, 2 2 2 8 6 1 2 2( 20 00)x x x x BK+ + + = + 11, 2 2 2 2 5 5 1 1 1( 20 01) 4 4 x x x x x PCCC + + = + 12, 2 ( 1) ( 2) 2 ( 2 2000 )x x x x ... = + + 28 , 2 7 4 4 ( Đô Đô 20 00) 2 x x x DL ng x + + = + 29 , 3 3 2 1 1 2( 95) 1 2 2 x GT x x + + = + 30, 2 2 2 1 x x x + = 31, 2 2 1 1 (1 2 1 )x x x+ = + 32, 2 2 (4 1) 1 2 2 1(Đ 78)x ... 17, 2 2 11 31x x+ + = 18, 2 ( 5) (2 ) 3 3x x x x+ = + 19, 2 2 3 3 3 6 3( 98)x x x x TM + + + = 20 , 2 3 2 5 1 7 1x x x+ = 21 , 2 3 2 4 3 4x x x x+ + = + 22 , 2 2 3 2 1( 99)x x x x NT + + = 23 ,...