设向量a,b满足:丨a丨=1,a*b=3/2,丨a+b丨=2根号2,则丨b丨=多少 求过程!
设向量a,b满足:丨a丨=1,a*b=3/2,丨a+b丨=2根号2,则丨b丨=多少 求过程!
设向量a.b满足|a |=|b |=1,|3a-2b |=3,求|3a+b|
设单位向量a,b满足|3a-2b|=根号7,(1)求a,b的夹角,(2)求|3a+b|的值
设a,b向量满足丨a丨=丨b丨=1,且丨3a-b丨=根号7.求2a+b与b的夹角.求丨3a+b丨/丨3a-b丨.
设向量a,向量b满足|向量a|=|向量b|=1,向量a●向量b=-1/2则|向量a 2向量b|等于
已知丨向量a丨=3,丨向量b丨=2,丨向量a-向量b丨=根号7,则向量a·向量b
设向量a,b满足|a|=1,|b|=根号2,|3a+b|=4,则|3a-2b|=________
设向量a,b满足|a|=|b|=1及|3a-2b|=3,若b=(0,1)求向量a的坐标
设向量a.b满足|a|=|b|=1,|3a-2b|=√7,求a+b与b夹角的大小
已知非零向量a,b满足丨a+b丨=丨a-b丨=2又根号3/3丨a丨,则a+b与a-b的夹角为
设向量a b满足|a|=|b|=1及|3a+2b|=根号7,求a,b的夹角求|3a-b|的值
1设向量a,b,c满足a⊥b,(a,c)=π/3,(b,c)=π/6,|a|=1,|b|=2,|c|=根号3,求a+b+