2006*(1-1/2)(1-1/3)(1-1/4)...(1-1/2005)(1-1/2006) =2006*(1/2)(2/3)(3/4)...(2004/2005)(2005/2006) =2006*(1/2006) =1 [-|98|+76+(-87)]*23[56+(-75)-(7)]-(8+4+3) 5+21*8/2-6-59 68/21-8-11*8+61 4.6-(-3/4+1.6...