A=3Y-X-YX二次方
a) 如果A=-9 , X=-3 , 求Y的值.
解以下方程式.
x 2x 4
--- - --- = ---
3 5 15
+解釋 thx 送5點給你!
我唔識Maths(5)
2008-11-02 6:06 am
回答 (4)
2008-11-02 7:58 am
✔ 最佳答案
A=3Y-X-YX²-9=3Y-(-3)-Y(-3)²
-9=3Y+3-9Y
-12=-6Y
Y=2
x 2x 4
--- - --- = x/3 - 2x/5 -4/15
3 5 15
=(5x-6x-4)/15
=(-x-4)/15
如果(-x-4)/15=0
-x-4=0
x=4
參考: 會考數學拿c既人~
2008-11-02 2:37 pm
係咪咁呀?
第一條:
A=3Y-X-YX
(-9)=3Y-(-3)-(-3Y)
(-12)=6Y
(-12)/6=Y
-2=Y
Y=-2
===
第二條:
2x/35-4x/15
=(-6)/35-(-12)/15
=[(-18)-(-84)]/105
=66/105
=22/35
====
2008-11-02 06:37:41 補充：
係咪咁呀?
第一條:
A=3Y-X-YX
(-9)=3Y-(-3)-(-3Y)
(-12)=6Y
(-12)/6=Y
-2=Y
Y=-2
===
第二條:
2x/35-4x/15
=(-6)/35-(-12)/15
=[(-18)-(-84)]/105
=66/105
=22/35
====
第一條:
A=3Y-X-YX
(-9)=3Y-(-3)-(-3Y)
(-12)=6Y
(-12)/6=Y
-2=Y
Y=-2
===
第二條:
2x/35-4x/15
=(-6)/35-(-12)/15
=[(-18)-(-84)]/105
=66/105
=22/35
====
2008-11-02 06:37:41 補充：
係咪咁呀?
第一條:
A=3Y-X-YX
(-9)=3Y-(-3)-(-3Y)
(-12)=6Y
(-12)/6=Y
-2=Y
Y=-2
===
第二條:
2x/35-4x/15
=(-6)/35-(-12)/15
=[(-18)-(-84)]/105
=66/105
=22/35
====
參考: 自己
2008-11-02 8:01 am
我都係....
唔明...
你第二條想問D咩??
唔明...
你第二條想問D咩??
2008-11-02 6:22 am
As follow AS~~~
圖片參考：http://www.photo-host.org/img/706004screenhunter_01_nov._01_22.16.gif
2008-11-01 22:22:21 補充：
第2題唔明你問乜
2008-11-02 07:34:41 補充：
(x/3) - (2x/5) = 4/15
5x-3(2x)=4
5x-6x=4
-x=4
x=-4
圖片參考：http://www.photo-host.org/img/706004screenhunter_01_nov._01_22.16.gif
2008-11-01 22:22:21 補充：
第2題唔明你問乜
2008-11-02 07:34:41 補充：
(x/3) - (2x/5) = 4/15
5x-3(2x)=4
5x-6x=4
-x=4
x=-4
收錄日期: 2021-04-23 20:34:51
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20081101000051KK02249