设随机变量X在(-1,2)上服从均匀分布求D(Y^2)怎么求简单
1年前1个回答
你能帮帮他们吗
精彩回答
The train had left the station I got there.
5个月前
It takes me five___________ (minute) to get there by bike.
6个月前
In Suzhou, it doesn’t often ___________ in winter, but it is ___________ in summer. ( )
6个月前
著名作家贾平凹说:“会活的人,或者说取得成功的人,其实懂得了两个字——舍得。”舍得,《现代汉语词典》解释为“愿意割舍,不吝惜”,实际意思偏向于“舍”。贾平凹的话是在告诉我们:______。
1年前
1年前