. Trong không gian vector ℝ3 cho hai hệ vector
{ } 1 2 3 ( 2,2,5); (2,1,3); (3,1,3) U u m u u = − = = = , { } 1 2 3 ( ( 1,2,1); ,2,1); ( 1,7,4) V v m v m v = = = − −= .
a. Chứng tỏ U , V là hai cơ sở của ℝ3
.
b. Cho x m = − ( ,2, 3), tìm tọa độ của x theo cơ sở V .
c. Tìm PU V →
và PV U →
.
d. Sử dụng công thức đổi tọa độ, tìm tọa độ của x theo cơ sở U .

x =±sqrt(1/3)

step-by-step explanation:

x+4/6x=1/x

multiply each side by 6x to get rid of the fractions

6x*(x+4/6x)=1/x*6x

distribute

6x^2 +4 = 6

subtract 4 from each side

6x^2 +4-4 = 6-4

6x^2 =2

divide by 6

6x^2/6 = 2/6

x^2 = 1/3

take the square root of each side

sqrt(x^2) = ±sqrt(1/3)

x =±sqrt(1/3)

susie has 7 apples

step-by-step explanation:

when the line is solid:

when the line is dashed:

this > inequality sign means:

this < inequality sign means:

this > inequality sign means:

this < inequality sign means:

about the problem:

srry i'm not done ! i'll

answer: what is the conflict?

step-by-step explanation:

*what has happened to new york city?

*what is in the time capsule?

* what did the kidz see that gave them hope?

*what will they do with what they find?

* how will they save the city?

* what challenges will they face along the way?

*what big choice will they make at the climax of the story?

* what lesson do they learn at the end of the story?