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
5/3×9/10除以(1+3/1)
=(5*9)/(3*10)÷4
=45/30÷4
=3/2*1/4
=3/8
答案是:0.375
5/3*9/10/4
按顺序计算就是