Let u = <-8, -9>. Find 7u?
回答 (3)
2019-01-24 5:12 am
✔ 最佳答案
<-56, -63> 
2019-01-24 6:01 am
7u = - 56 i - 63 j
2019-01-24 5:53 am
If u=<a,b> , m ∈ R then mu=<ma , mb>
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