问题
填空题
若
|
答案
∵
+λa
=(5-λ,-7+2λ),(b
+λa
)⊥b
,b
∴(
+λa
)•b
=-(5-λ)+2(-7+2λ)=0,解得λ=b
.19 5
故答案为
.19 5
若
|
∵
+λa
=(5-λ,-7+2λ),(b
+λa
)⊥b
,b
∴(
+λa
)•b
=-(5-λ)+2(-7+2λ)=0,解得λ=b
.19 5
故答案为
.19 5