涉及向量

goodstudygood2022-10-04 11:39:542条回答

涉及向量

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haimingwei1211 共回答了12个问题 | 采纳率75%
因为ABC共线
所以可设AB=tAC
即OB-OA=t(OC-OA)
整理一下得OB=(1-t)OA+tOC
(以上都是指向量)
所以a1=1-t,a200=t
所以a1+a200=1
S200=200(a1+a200)/2=100
1年前
王码网站 共回答了7个问题 | 采纳率
因为共线,所以a1+a200=1这是性质,所以S200会了吧
1年前

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i found him dressing himself when i entered the room.(涉及dres
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这样说对吗?这种情况下是该用dressing吧.
虽然dress一般是用dressed做宾补.但如果dress后面有宾语呢?正如此句i found him dressing himself when i entered the room.(
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