快D回答我~!
2007-03-26 17:23:43 · 11 個解答 · 發問者 致傑 1 in 科學 ➔ 數學
我睇完樓上的回答,最叻都係岩一半。
y=12, or y= -12
代入y=12, 5*12*12=720
代入y=-12, 5*-12*-12=720
所以係有兩個答案。
2007-03-28 12:24:23 補充:
第一個答案係十二、另一個係(負)十二,負數係電腦是接近看不到。
2007-04-10 22:29:00 補充:
多謝各位投我的人。多謝!
2007-03-27 11:26:04 · answer #1 · answered by 丫發 7 · 0⤊ 0⤋
樓上的,你去考多次O Level罷啦,
唔怪得人地話GCE容易過香港會考,
SQUARE ROOT有正負都唔識就拿A.
降低採用率都要話下你.
(最好檢舉我,咁就唔洗降低啦)
2007-04-05 15:58:51 補充:
樓下的,〔路〕是不是〔路家敏〕?
2007-04-05 20:51:13 補充:
有點印象. [路]的我對[小時候], [道理真巧妙]懂多一點, 畢竟她演小時候時, 我真的是很小的時候.
2007-04-10 22:18:40 補充:
恭喜正確答案成功獲選!
2007-04-04 06:25:05 · answer #2 · answered by Liar大話精 6 · 0⤊ 0⤋
5y² = 720
y² = 144
y = √144
y=12, or y= -12
代入y=12, 5*12*12=720
代入y=-12, 5*-12*-12=720
所以y係有兩個答案。
2007-03-28 15:48:58 · answer #3 · answered by ? 6 · 0⤊ 0⤋
5Y*5Y=720
25Y=720
Y =720/25
Y=28.8
2007-03-27 11:37:42 · answer #4 · answered by 芝芝 6 · 0⤊ 0⤋
請你問清楚條問題..
5y*y=720
y*y =144
y = 12
5y*5y=720
y*y = 28.8
y =
5.37
2007-03-26 17:35:37 · answer #5 · answered by Pui Hin 2 · 0⤊ 0⤋
5y=720
5y=720
--- ----
5 5
y =144
2007-03-26 21:36:13 補充:
5y² = 720y² = 144y = √144y = 12
2007-03-26 21:37:20 補充:
你可以借一些book see可以....
2007-03-26 17:35:33 · answer #6 · answered by kwokshing_mak 2 · 0⤊ 0⤋
張720開方=26.83281573
張26.83281573/5=5.366563146
約幾多個位就自己想,
我會約3個位,
唔知你老師想咩!
2007-03-26 21:43:25 補充:
可以全部打落CASIO fx-3650pSUPER-FX,(開方720)/5=5.366563146
2007-03-26 17:35:03 · answer #7 · answered by 朗 2 · 0⤊ 0⤋
------------------------------------
5y² = 720
y² = 144
y = √144
y = 12
------------------------------------
2007-03-26 17:33:51 · answer #8 · answered by LEO LEUNG 2 · 0⤊ 0⤋
5y的2次方 = 5y x 5y = 25y2次方
5y的2次方=720
25y2次方=720
y2次方=28.8
y=28.8開方
y=5.366563146
2007-03-26 17:28:56 · answer #9 · answered by 我 3 · 0⤊ 0⤋
5y^2 = 720
y^2 = 144
y = 12
2007-03-26 17:27:09 · answer #10 · answered by Marie 6 · 0⤊ 0⤋