Trong không gian vector 3 ℝ cho hai hệ vector U u m u u = { 1 2 3 = − = = ( 2,2,5); (2,1,3); (3,1,3)} , V v m v m v = − −= { 1 2 3 = = ( ( 1,2,1); ,2,1); ( 1,7,4)} . a. Chứng tỏ U , V là hai cơ sở của 3

step-by-step explanation:

given perimeter: 28cm

length: 9cm

atp,

2(l+w)=p of the reactangle

2(9+x)=28

18+2x=28

2x=28-18

x=10/2

x=5

therefore width is 5 cm

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