Question

向量加减法怎么做呢 、、上课纠结死我了 唔.

Answer 1

let a,b be nth dimensional vector

a= (a1,a2,..,an)

b= (b1,b2,...,bn)

a+b =(a1,a2,..,an) + (b1,b2,...,bn) = ( a1+b1,a2+b2,...,an+bn)

a-b =(a1,a2,..,an) - (b1,b2,...,bn) = ( a1-b1,a2-b2,...,an-bn)

e.g n=2

a=(a1,a2),b=(b1,b2)

a+b= (a1+b1,a2+b2)

a-b= (a1-b1,a2-b2)