also, an easy one x/2 - x =1
an can anyone explain the difference between a false equation and an identity? Thanks
2x + 5 = 7 - 6x =3? Math help?
2008-09-29 2:20 pm
回答 (4)
2008-09-29 2:40 pm
✔ 最佳答案
If 2x+ 5=3,x=-1then If 7-6x=3,-6x=-4,x=3/2!!!!!!!!!!!===================================================
1/2 x - x =1,-1/2x=1,x=-2 o.k.
2008-09-29 9:42 pm
1)
2x + 5 = 7 - 6x
2x + 6x = 7 - 5
8x = 2
x = 2/8
x = 1/4 (0.25)
2)
x/2 - x = 1
2(x/2 - x) = 2(1)
x - 2x = 2
-x = 2
x = 2/-1
x = -2
2x + 5 = 7 - 6x
2x + 6x = 7 - 5
8x = 2
x = 2/8
x = 1/4 (0.25)
2)
x/2 - x = 1
2(x/2 - x) = 2(1)
x - 2x = 2
-x = 2
x = 2/-1
x = -2
2008-09-29 9:39 pm
1. look at 2x+5=3...
2x=-2
x=-1
------ then
7-6x=3
-6x=-4
6x=4
x=2/3
-----
identity: 1=1 or NE expresshun yu kan redues tu 1=1
2x=-2
x=-1
------ then
7-6x=3
-6x=-4
6x=4
x=2/3
-----
identity: 1=1 or NE expresshun yu kan redues tu 1=1
2008-09-29 9:27 pm
there is no false equation here.
2x+5=7 ==>2x=7-5 =>2x=2 =>x=1
now
-6x=3 =>6x=-3=>x=(-3)/6 =>x=-0.50
both are "correct equations... equations with 1 unknown (x) can not be "wrong" ..there is always a solution
2x+5=7 ==>2x=7-5 =>2x=2 =>x=1
now
-6x=3 =>6x=-3=>x=(-3)/6 =>x=-0.50
both are "correct equations... equations with 1 unknown (x) can not be "wrong" ..there is always a solution
收錄日期: 2021-05-01 11:13:02
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080929062039AA1yebU