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a1=(-2,3),b1=(4,6) a2=(1,-2),b2=(7,14) a3=(2,3),b3=(3,2) a4=(-3,2),b4=(6,-4)
区间[1,2]和[2,3] 区间[2,3]和[3,4] 区间[2,3]和[3,4]和[4,5] 区间[3,4]和[4,5]和[5,6]
(﹣2,﹣3) (2,﹣3) (﹣2,3) (2,3)
(-2,3) (2,-3) (2,3) (-2,-3)
(4,-2,4) (-4,2,-4) (2,-3,4)
-2 2 -
(4,-2,4) (-4,2,-4) (2,-3,4)
(2,3,-4) (-2,3,4) (2,-3,4) (-2,-3,4)
1 2 3
)(-2,3) ( )(2,-3) ( )(2,3) ( )(-2,-3)
胸骨右缘第3,4肋间 胸骨左缘第2,3肋间 胸骨右缘第2,3肋间 胸骨左缘第3,4肋间 胸骨左缘第4,5肋间
(1,2)、 (3,5),将向量按向量a=(-1,-1)平移后得到向量为 ( ) A. (2,3)B. (1,2) (3,4) (4,7)