Let u=<-3,5> and v=<4,2>.
Find:
a) -3u
b)2u+5v
c)2u-7v
Trigonometry Vectors in the Plane Question, Please Help?
2018-03-14 2:24 pm
回答 (3)
2018-03-14 8:24 pm
✔ 最佳答案
a)-3u
= -3<-3,5>
= <9,-15>
b)
2u = 2<-3,5>= <-6,10>
5v= 5<4,2>= <20,10>
2u+5v = <-6,10)+ <20,10>
= <14,20>
c)
2u = 2<-3,5> = <-6,10>
7v =7<4,2> = <28,14>
2u-7v = <-6,10>-<28,14>
= <-34,-4>
2018-03-14 3:07 pm
a)
-3u
= -3<-3,5>
= <9,-15>
b)
2u + 5v
= 2<-3,5> + 5<4,2>
= <-6,-10> + <20,10>
= <14,0>
c)
2u - 7v
= 2<-3,5> - 7<4,2>
= <-6,10> - <28,14>
= <-34,-4>
-3u
= -3<-3,5>
= <9,-15>
b)
2u + 5v
= 2<-3,5> + 5<4,2>
= <-6,-10> + <20,10>
= <14,0>
c)
2u - 7v
= 2<-3,5> - 7<4,2>
= <-6,10> - <28,14>
= <-34,-4>
2018-03-14 9:34 pm
a)
- 3u = { 9 , - 15 } = 9 i - 15 j
b)
- 6 i + 10 j + 20 i + 10 j = 14 i + 20 j
c)
- 6 i + 10 j - 28 i - 14 j = - 34 i - 4 j
- 3u = { 9 , - 15 } = 9 i - 15 j
b)
- 6 i + 10 j + 20 i + 10 j = 14 i + 20 j
c)
- 6 i + 10 j - 28 i - 14 j = - 34 i - 4 j
收錄日期: 2021-05-01 22:22:28
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