which one is a surd? please help!

2007-07-18 5:32 am

http://x4b.xanga.com/c3bd827112533136026862/t99728822.bmp

計左呢題好耐
我計左好耐,a,b都應該係surd
但係佢又話得一個係surd
咁我想請教大家,究竟邊個係surd
同埋可以俾解釋俾我聽嗎?
大大唔該哂!!!

回答 (3)

2007-07-18 5:53 am

✔ 最佳答案

As follows:

圖片參考：http://i117.photobucket.com/albums/o61/billy_hywung/Jul07/Crazysurd1.jpg

所以答案是 A, 因為只有它最後答案中的開方根號內含有不是 perfect square (平方數) 的數在內.

參考: My Maths knowledge

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2007-07-18 6:26 pm

A. √4 / √10
= 2 / √10

B. √242 / √18
= 11√2 / 3√2
= 11 / 3

C. √0.0016
= 0.04

D. √47.61
= 6.9

So the answer is A.

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2007-07-18 5:52 am

答案:A
B= √(242/18) =√(121/9) =√((11/3)^2) = 11/3
C= √0.0016=√(0.04^2)=0.04
D= √47.61=√((6.9)^2) = 6.9
.'. A is a surd

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