7[x-3(3-x)]=21
唔該哂
中一數學題
2007-05-11 7:32 am
回答 (9)
2007-05-13 5:48 pm
7[x-3(3-x)]=21
x-3(3-x)=21over7
3-x=3over x-3
3-x=3overx-1
3-x+1=3over x
4-x=3overx
既然4減去的果等於3除的果，x只會是1。
x-3(3-x)=21over7
3-x=3over x-3
3-x=3overx-1
3-x+1=3over x
4-x=3overx
既然4減去的果等於3除的果，x只會是1。
2007-05-13 4:49 pm
x=3.....
2007-05-12 1:22 am
7[x-3(3-x)]=21
7[x-9-3x]=21
7x-63-21x=21
7x-21x=84
-14x-63=21
-14x=84
x=-6
7[x-9-3x]=21
7x-63-21x=21
7x-21x=84
-14x-63=21
-14x=84
x=-6
2007-05-11 5:01 pm
7[x-3(3-x)]=21
7(x-9+3x)=21
7x-63+21x=21
28x-63=21
28x=21+63
28x=84
28x/28=84/28
x=3
7(x-9+3x)=21
7x-63+21x=21
28x-63=21
28x=21+63
28x=84
28x/28=84/28
x=3
參考: me
2007-05-11 7:41 am
7(x-9+3x) = 21
7(4x-9) = 21
28x-63=21
28x=21+63
28x=84
x=3
7(4x-9) = 21
28x-63=21
28x=21+63
28x=84
x=3
2007-05-11 7:41 am
7[x-3(3-x)]=21
7(3x-9-2x+3x)=21
3x-9-2x+3x=21/7
6x-2x=3+9
4x=12
x=3
7(3x-9-2x+3x)=21
3x-9-2x+3x=21/7
6x-2x=3+9
4x=12
x=3
2007-05-11 7:37 am
7[x-3(3-x)]=21
7[x-9+3x]=21
7[4x-9]=21
4x-9=3
4x=12
x=3
7[x-9+3x]=21
7[4x-9]=21
4x-9=3
4x=12
x=3
收錄日期: 2021-04-23 21:22:57
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070510000051KK05433