將以下根式化為最簡根式
1a)√338
b)√169/16
c)-√0.81
d)-√4又49分之29
2)計算下列各題(答案可保留根式)
a)6√3+5√3-3√3
b)√125-√5
c)5√2-√8+3√2
d)√8 *√18
有理數及無理數!plz come!10 marks!
2007-08-22 1:25 am
回答 (2)
2007-08-22 4:05 am
✔ 最佳答案
1.(a). √338 = √169 x 2 = 13 √2
(b). √169 / 16 = 13 / 16
(c). - √0.81 = - 0.9
(d). - √(4 + 29 / 49) = - √225 / 49 = - 15 / 7
2.
(a). 6 √3 + 5 √3 - 3 √3 = 8 √3
(b). √125 - √5
= √25 x 5 - √5
= 5 √5 - √5
= 4 √5
(c). 5 √2 - √8 + 3 √2
= 5 √2 - √4 x 2 + 3 √2
= 5 √2 - 2 √2 + 3 √2
= 6 √2
(d). √8 x √18
= √144
= 12
2007-08-22 1:31 am
1a) 13√2
b) √13/4
c) -0.9
d)15/7
2a) 8√3
b) 4√5
c) 6√2
d) 12
b) √13/4
c) -0.9
d)15/7
2a) 8√3
b) 4√5
c) 6√2
d) 12
收錄日期: 2021-05-01 20:33:27
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