... (0.5 ) 2 2 + + + + 1 .2. 3 2. 3.4 3.4.5 20 09 .20 10 .20 11 1 1 1 + + + S= 1 .2 2.3 3.4 4.5 20 09 .20 10 20 10 .20 11 1 1 S= = < Vy S < P 1 .2 2010 .20 11 20 10 .20 11 S= 0 ,25 0 ,25 ễN THI HC K ễN THI S ... Bi1: (2. 0) Bi 2: (1.0) Bi 3: (1.5 ) a)( 18 + 25 ) ( 125 18 + 25 ) = ( -18 + 18 ) + ( 25 -25 ) - 125 = - 125 1 1 1 ).( ) =0 b) ( ).( ) =( 12 2011 20 12 12 2011 10 12 (2) (2) 8 16 16 14 + ... : 12 12 10 23 = + 12 10 115 42 + = 60 60 157 37 =2 = 60 60 Mt gi ngi ú i c l: 8: = = 12 km /S: 12 km - V ỳng hỡnh im 0,5 0 ,25 0 ,25 0 ,25 0,5 0 ,25 0 ,25 0 ,25 0 ,25 0 ,25 0 ,25 0 ,25 0,75 0.5 0,5...