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设平面向量,满足2+=(3,3),﹣2=(﹣1,4),若,的夹角为θ,则cosθ=
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高一上学期数学《》真题及答案
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关于平面向量abc有下列三个命题①若a·b=a·c则b=c②若a=1kb=-26a∥b则k=-3③非
设向量a=33b=1-1.若a+λb⊥a-λb则实数λ=________.
设平面向量a=-10b=02则2a-3b=
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若平面向量ab满足|a+b|=1a+b平行于x轴b=2-1则a=.
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设平面向量a=35b=-21则a-2b=
(7,3)
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(1,7)
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若平面向量ab满足|a+b|=1a+b平行于x轴b=2-1则a=.
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