問題: 4x² = 1
我做
4x² - 1 = 0
然後ㄋ?
x (4x - 1) = 0 這樣對嗎?
2005-04-06 17:45:18 · 21 個解答 · 發問者 changchih 7 in 教育與參考 ➔ 其他：教育
不不~是4x2-1=0~然後(2x+1)(2x-1)=0x=1/2,-1/2
2005-04-06 17:47:43 · answer #1 · answered by Anonymous · 0⤊ 0⤋
妳的數學太差了---這是你應該處裡的"問題"
2005-04-08 07:54:44 · answer #2 · answered by Anonymous · 0⤊ 0⤋
真是太感謝大家了....我應該怎麼處理這個問題?自己選嗎還是投票?
2005-04-08 07:14:19 · answer #3 · answered by changchih 7 · 0⤊ 0⤋
4X²=1 可換算求得 X=1/2
X (4X - 1) = 1/2 才對
2005-04-06 17:56:56 · answer #4 · answered by kkk789 5 · 0⤊ 0⤋
正確作法應該是
4x² = 1
同除4
x² = 1/4
x = 1/2 或 - 1/2
以你的方法只會把問題複雜化
而且要把x提出必須連1也除x
也就是x (4x - 1/x) = 0
2005-04-06 17:53:07 · answer #5 · answered by Anonymous · 0⤊ 0⤋
當然錯ㄚ
x(4x-1) 是 4x平方-1x 多了一個xㄡ
4x2-1 = (2x-1)(2x+1)=0 因式分解
所以x=1/2 或 -1/2
了解了吧
2005-04-07 18:13:40 補充：
是大家數學太好, 還是數學太差, 這個問題有21個人回答ㄟ...真是一個直得"推薦"的"好"問題ㄚ...雖然我也是搶答的一個人之一, 唉....
2005-04-06 17:52:05 · answer #6 · answered by 杰宏 2 · 0⤊ 0⤋
4x² = 1
x² = 1/4
x = 1/16
應該吧= ="
2005-04-06 17:51:21 · answer #7 · answered by Anonymous · 0⤊ 0⤋
x (4x - 1) = 0~~~是錯ㄉ~~
應為:將4x² - 1看作(a+b)(a-b)=a²-b²
所以(2x+1)(2x-1)=0~~~~此代表(2x+1)或(2x-1)必有一者為0
然後自己算ㄅ^^~
2005-04-06 17:50:01 · answer #8 · answered by 憂鬱小陞 2 · 0⤊ 0⤋
4x² - 1 = 0
x²= 1/4
x=1/2 或 -1/2
2005-04-06 17:48:40 · answer #9 · answered by Anonymous · 0⤊ 0⤋
4x² = 1
同除以４→ x² ＝１／４
兩邊都開根號→ ｘ＝１／２
2005-04-06 17:48:05 · answer #10 · answered by 夏 雨天 4 · 0⤊ 0⤋