sos em là pi tiên cứu pé

1) 1 3 2x 2 3 X-2 x+2 X = = 2x+1 2) =1; 2x-1 X x+4 x-2 2 7 -x; 5) ; 6) = x-2 x-1 x+1 x-8 x+6 3 14 3 7 3 ; 8) ;9) =0; 2(x-1) x+1 x-6 3x-9 X-3 4 7 2 3 1 61 10) =1; 11) = ; 12) 2x-3 3x-5 x+1 x+5 3x+3 x+3 x-4