(2一1÷2)x(2一2÷3)x(2一3÷4)x……(2一|999÷2000)

问题描述:

(2一1÷2)x(2一2÷3)x(2一3÷4)x……(2一|999÷2000)

=(3/2)*(4/3)*(5/4)*……*(2001/2000)
=(3*4*5*6*7*……*2001)/(2*3*4*5*6*^*2000)
=2001/2
=1000.5