若非零向量a,b满足丨a+b丨=丨b丨,则A.丨2a丨>丨2a+b丨B.丨2a丨<丨2a+b丨C.丨2b丨>丨a+2b丨D.丨2b丨<丨a+2b丨
问题描述:
若非零向量a,b满足丨a+b丨=丨b丨,则
A.丨2a丨>丨2a+b丨
B.丨2a丨<丨2a+b丨
C.丨2b丨>丨a+2b丨
D.丨2b丨<丨a+2b丨
答
若非零向量a,b满足丨a+b丨=丨b丨,则
A.丨2a丨>丨2a+b丨
B.丨2a丨<丨2a+b丨
C.丨2b丨>丨a+2b丨
D.丨2b丨<丨a+2b丨