... 2 (b - c) (c - a) (a - b) Luyn thi vo lp 10 - Nm hc 2011 - 2012 b) Tớnh giỏ tr ca biu thc: A = 2 010 - 2 010 + + 2 010 ữ - 2 010 2 010 ữ 4 1+ + 2 010 2 010 + 2 010 Cõu 2: a) Cho a, b, c l di cnh ... sn xut c: y + 10% y C hai t sn xut c: 1,15x + 1,10y = 101 0 (2) T (1), (2) ta cú h phng trỡnh: x + y = 900 1,1x + 1,1y = 990 0, 05x = 20 1,15x + 1,1y = 101 0 1,15x + 1,1y = 101 0 x + y = 900 ... IH Cõu 5: x + 2 010 = 2 010 (1) iu kin: x - 20 (1) x + x + Ta cú x + x + 1 x + ữ - x +2 010 - ữ = 2 x + 2 - x - 2 010 + x + 2 010 - =0 1 = x + 2 010 - (2) 2 1 = - x + 2 010 + (3) 2 x +...