已知向量OA=向量a,向量OB=向量b,且|向量a|=|向量b|=4,角AOB=60度,则|向量a+向量b|= ,|向量a-向量b|=
已知向量OA=向量a,向量OB=向量b,且|向量a|=|向量b|=4,角AOB=60度,则|向量a+向量b|= ,|向量a-向量b|=
数学人气:295 ℃时间:2020-03-23 16:29:27
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8和4 画图 1为三角形中线2倍 2为三角形第3边
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