(1-1/2)x(1十1/2)x(1一1/3)x(

(1-1/2)x(1十1/2)x(1一1/3)x(1十1/3)x(1一1/4)x(1十1/4)x……X(1一1/99)x

1个回答

(1-1/2)×(1+1/2)×(1-1/3)×(1+1/3)×(1-1/4)×(1+1/4)×……×(1-1/99)×(1+1/99)
=1/2×3/2×2/3×4/3×3/4×5/4×……×98/99×100/99
=1/2×100/99 【中间的约去了!】
=50/99