一乘三分之二加上三乘5分之二加上五乘七分之二一直加到九百九十九乘以二千零一分之二

2024-12-24 12:00:33
推荐回答(2个)
回答1:

是一直乘到1001吧?

(1乘3)分之2,加(3乘5)分之2,加(5乘7)分之2,再加加加到(999乘1001)分之2

2/(1×3)+2/(3×5)+2/(5×7)+…+2/(999×1001)
=(1-1/3)+(1/3-1/5)+(1/5-1/7)+…+(1/999-1/1001)
=1-1/1001=1000/1001

回答2:

解:
2/(1×3)+2/(3×5)+2/(5×7)+…+2/(999×1001)
=(1-1/3)+(1/3-1/5)+(1/5-1/7)+…+(1/999-1/1001)
=1-1/1001=1000/1001