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共找到 8326 与B={t 相关的结果，耗时40 ms
已知向量a=(2,1)与向量b(1,2),要使/向量a+向量b/最小,则实数t的值为?已知向量a=(2,1)与向量b(1,2)，要使/向量a+t向量b/最小，则实数t的值为？
数学
平面向量的数量积.证明已知a b 是两个非零已知向量,当a+tb(t属于R）的模取最小值时,求t的值以及证明b与a+tb(t属于R）垂直 t的值我已算出,
数学
下列关于匀速直线运动的x一t图象、v一t图象的说法正确的有（）A．x一t图象表示物体运动的轨迹，v一t图象不表示物体运动的轨迹B．在x一t图象中不能表示出物体速度的大小C．在v一t图
其他
A:He has already gone back to australia,______ ? B:_______.He's on a visit to Qingdao.A.isn't he;No B.hasn't he;Yes C.isn't he;Yes
英语
D.hasn't he;N
She didn't come to school yesterday,didn't she?B:_____.Though she was not feeling very well.A.Yes,she didn't.B.Yes,she did.C.No,she di
英语
.D.No,she didn
两道英语填空选择The Fangs all ___ better now.They believe they shouldn"t be lazy."We __1__ exercise every day,but we should try our ___2___ to
英语
exercise as of
——late for school again ,Tim!------Sorry ,I promise that I____.late for school again ,Tim!------Sorry ,I promise that I____. A.Don't;
英语
on't B.Don't b
—mum,will you take me to the park tomorrow?—If it____rainy.A won‘t B doesn't C isn’t D won't be提问：为什么选C而不选B,理由,
其他
Nobody but I knows Japanese in my class,A．does he B．doesn’t he C．do they D．don’t theyNobody but I knows Japanese in my class,________?
英语
．does he B．doe
请问这道题为何选 A：I don't hope there won't be enough space on Earth for us to live.B:No,I______.选择：A.don't hope B.hope C.don't hope so D.hope
英语
not 请问为何答案是D,而
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