> 数学 >
(99又1/2)^2,简便计算
人气:268 ℃ 时间:2020-01-29 05:42:24
解答
(99又1/2)^2
=99又1/2*99又1/2
=99又1/2*(100-1/2)
=(99+1/2)*100-(99+1/2)*1/2
=99*100+1/2*100-99*1/2-1/2*1/2
=9900+(1/2*100-99*1/2)-1/2*1/2
=9900+1/2*(100-99)-1/4
=9900+1/2-1/4
=9900又1/4
推荐
猜你喜欢
© 2024 79432.Com All Rights Reserved.
电脑版|手机版