Let u =7i-3j and w=-i-5j. find ||w-u||?
回答 (3)
2016-11-06 5:10 pm
w - u = - 8 i - 2 j
I w - u I = [ 68 ]^(1/2) = 2 √17
I w - u I = [ 68 ]^(1/2) = 2 √17
2016-11-06 10:52 am
u = 7i – 3j
w = -i – 5j
║ w - u ║
w – u = - i – 5j – (7i – 3j)
= - i – 5j -7i + 3j
= - 8i – 2j
|w - u| = √ [(8)² + (2)²]
= √ (64 + 4)
= √ (68)
= 2√ (17)
w = -i – 5j
║ w - u ║
w – u = - i – 5j – (7i – 3j)
= - i – 5j -7i + 3j
= - 8i – 2j
|w - u| = √ [(8)² + (2)²]
= √ (64 + 4)
= √ (68)
= 2√ (17)
2016-11-06 4:14 am
||w-u|| = 2 sqrt(17)
收錄日期: 2021-04-21 23:55:30
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