> 数学 >
2*(3+1)*(3^2+1)*(3^4+1)*……*(3^22+1)+1怎么算
人气:145 ℃ 时间:2020-01-28 05:24:08
解答
22应该是32
2*(3+1)*(3^2+1)*(3^4+1)*……*(3^32+1)+1
=(3-1)*(3+1)*(3^2+1)*(3^4+1)*……*(3^32+1)+1
=(3^2-1)*(3^2+1)*(3^4+1)*……*(3^32+1)+1
=(3^4-1)*(3^4+1)*……*(3^32+1)+1
反复用平方差
=3^64-1+1
=3^64
推荐
猜你喜欢
© 2024 79432.Com All Rights Reserved.
电脑版|手机版