... 3C2010 + + x 20 11C2010 Lyohmtngvtac: VI. 20 10 (1im) (1 + x ) 20 10 + 20 10 x (1 + x ) 20 09 = C2010 + xC2010 + 3x 2C2010 + +20 11 20 10C2010 x +Chox=1tac: C 20 10 VyS= 1005 .2 20 10 + 2C 20 10 + 3C 20 10 ... - Ê (2 + 3) x - x 0 ,25 Ê + -1 Ê x - x Ê1 0 ,25 - Ê x Ê + 2. 0 ,25 20 10 +Cú (1 + x )20 10 = C2010 + xC2010 + x 2C2010 + +x 20 10C2010 +Nhõnchaivvixtac: 20 10 x (1 + x ) 20 10 = xC2010 + x 2C2010 + ... CúGthucngthngx+y 2= 0nờn: (1im) x1 + x2 - y1 + y - + - = x1 + x2 + y1 + y2 =8 (1). 3 ỡ x = - 2y CúA,Bthucngthng:x+2y 3=0 nờn (2) ,suyra ợx2 = - 2y2 x1 + x2 + 2( y1 + y 2) =6(3). 0 ,25 0 ,25 0 ,25 0 ,25 ỡ x...