下面2題方程式唔識!!
回答 (5)
2010-08-12 6:35 am
參考: 自己
2010-08-12 3:20 am
1.15-2x=3
15-2x+2x = 3+2x
15 = 3+2x
15-3 = 3+2x-3
12 = 2x
12/2 = 2x/2
6 = x
x = 6
15-2x+2x = 3+2x
15 = 3+2x
15-3 = 3+2x-3
12 = 2x
12/2 = 2x/2
6 = x
x = 6
2010-08-12 12:33 am
15-2x=3
15-2x=3
15-3=2x(3 go to left hand side so 3 change to -3 and -2x go to right hand side so -2x change to 2x)
12=2x
12 2x
----=-----
2 2
6=x
x=6
2(7-y)=6
2(7-y)=6
2×7-2×y=6
14-2y=6
14-6=2y(the same as the question above!)
8=2y
8 2y
--=----
2 2
4=y
y=4
超詳細la,hope it can help you and let you know how to do!:)
2010-08-11 16:35:20 補充：
Q.1
係12除2 and 2y除2
Q.2
係8除2 and 2y除2
15-2x=3
15-3=2x(3 go to left hand side so 3 change to -3 and -2x go to right hand side so -2x change to 2x)
12=2x
12 2x
----=-----
2 2
6=x
x=6
2(7-y)=6
2(7-y)=6
2×7-2×y=6
14-2y=6
14-6=2y(the same as the question above!)
8=2y
8 2y
--=----
2 2
4=y
y=4
超詳細la,hope it can help you and let you know how to do!:)
2010-08-11 16:35:20 補充：
Q.1
係12除2 and 2y除2
Q.2
係8除2 and 2y除2
2010-08-12 12:12 am
下面2題方程式唔識!!
15-2x=3 =
15-2x=3
15=3+2x
15-3=2x
12=2x
12/2=x
6=x
x=6
2(7-y)=6
7-y=6/2
7-y=3
7=3+y
7-3=y
4=y
y=4
15-2x=3 =
15-2x=3
15=3+2x
15-3=2x
12=2x
12/2=x
6=x
x=6
2(7-y)=6
7-y=6/2
7-y=3
7=3+y
7-3=y
4=y
y=4
收錄日期: 2021-04-16 00:52:47
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20100811000051KK01073