1) 2
X -4X+2=0
2) 2
8X -X-4=0
3) 2
X +1=-6(X+2)
4) 2
16X =(2-3X)(2+3X)
5) (3X-2)(2X+1)=(3X-2)(X+1)
唔該大家幫幫忙._<
二次公式40分
2009-10-20 3:19 am
回答 (3)
2009-10-20 5:29 am
✔ 最佳答案
(1) x^2 - 4x + 2 = 0x = [4 +/- √(16 - 8)] / 2
x = 2 +/- √2
(2) 8x^2 - x - 4 = 0
x = [1 +/- √(1 + 128)] / 16
x = (1 +/- √129)/16
(3) x^2 + 1 = -6(x + 1)
x^2 + 1 + 6x + 6 = 0
x^2 + 6x + 7 = 0
x = [-6 +/- √(36 - 28)] / 2
x = -3 +/- √2
(4) 16x^2 = (2 - 3x)(2 + 3x)
16x^2 = 4 - 9x^2
25x^2 = 4
(5x)^ = 2^2
5x = +/-2
x = +/- 2/5
(5) (3x-2)(2x+1)=(3x-2)(x+1)
(3x - 2)[(2x + 1) - (x + 1)]=0
(3x - 2)(x) = 0
x = 0 or x = 2/3
2009-10-20 3:33 am
佢個個係2次方
2009-10-20 3:23 am
我識做,不過題號右邊果個2係咩?
收錄日期: 2021-04-23 23:22:42
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20091019000051KK01140