你好:
1/8×[1/2÷(3/5×10/9)]×(1+1/2)×(1-1/2)×(1+1/3)×(1-1/3)×………×(1+1/9)×(1-1/9)
=1/8×[1/2÷3/5÷10/9]×(1+1/2)×(1+1/3)×(1+1/4)×……×(1+1/9)×(1-1/2)×(1-1/3)×(1-1/4)×……×(1-1/9)
=1/8×[1/2×5/3×9/10]×3/2×4/3×5/4×……×10/9×1/2×2/3×3/4×4/5×……×8/9
=1/8×3/4×5×1/9
=5/96
1/8×[1/2÷(3/5×10/9)]×(1+1/2)×(1-1/2)×(1+1/3)×(1-1/3)×………×(1+1/9)×(1-1/9)
=1/8×【1/2÷2/3】×(1+1/2)×(1+1/3)×……×(1+1/9)×(1-1/2)×(1-1/3)×……×(1-1/9)
=1/8×3/4×3/2×4/3×……×10/9×1/2×2/3×……×8/9
=3/32×10/2×1/9
=5/96