maths!!!急!!
2009-01-05 3:08 am
the length of the rectangle is 7X cm and the width is (3X + 8) CM. If the lenght is 4 CM longer than the width, find the length of the rectangle.
回答 (3)
2009-01-05 3:20 am
✔ 最佳答案
length=7X cm width=(3X + 8) cm
7X-(3X+8)=4
4X-8=4
4X=12
X=3
length
=7X
=7*3
=21cm
參考: me
2009-01-05 7:01 am
7X - (3X+8) = 4
7X - 3X - 8 = 4
7X - 3X = 4 + 8
4X = 12
X = 12/4
X = 3
2009-01-04 23:01:58 補充：
漏左....
the length = 7X = 7(3) = 21
7X - 3X - 8 = 4
7X - 3X = 4 + 8
4X = 12
X = 12/4
X = 3
2009-01-04 23:01:58 補充：
漏左....
the length = 7X = 7(3) = 21
2009-01-05 3:22 am
7x = (3x+8) +4
7x= 3x+12
4x=12
x=3
2009-01-04 19:23:05 補充：
sub x =3 into 7x
7(3)
=21
7x= 3x+12
4x=12
x=3
2009-01-04 19:23:05 補充：
sub x =3 into 7x
7(3)
=21
收錄日期: 2021-04-23 23:13:26
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20090104000051KK01871