(1-1⼀4×(1-1⼀9)×(1-1⼀16)×...×(1-1⼀10000)怎么解

急急急急
2024-12-24 12:19:04
推荐回答(2个)
回答1:

(1-1/4)×(1-1/9)×(1-1/16)×...×(1-1/10000)
=(1-1/2)(1+1/2)(1-1/3)(1+1/3)(1-1/4)(1+1/4)……(1-1/100)(1+1/100)
=(1/2)(3/2)(2/3)(4/3)(3/4)(5/4)……(99/100)(101/100)
=(1/2)*(101/100)
=101/200
中间项两两抵消了。

回答2:

用平方差公式打开,然后约分,答案:101/200