1 ) 3x+5(x-3)=9
2 ) 4(2x-3)=7(x-1)
3 ) 4(x-1)=3(x+3)-(x-9)
4 ) 4x-[7-2(x-1)]=x+11
要步驟 -口-"
幾題中一數學(急)
2007-10-28 7:07 pm
回答 (2)
2007-10-28 7:13 pm
✔ 最佳答案
1 ) 3x+5(x-3)=93x+5x-15=9
8x=24
x=3
2 ) 4(2x-3)=7(x-1)
8x-12 =7x-7
8x-7x=-7+12
x=5
3 ) 4(x-1)=3(x+3)-(x-9)
4x-4=3x+9-x+9
4x-4=2x+18
2x =22
x=11
4 ) 4x-[7-2(x-1)]=x+11
4x-(7-2x+2) =x+11
4x-7+2x-2=x+11
6x-x =11+9
5x=20
x=4
2007-10-28 7:25 pm
1解:3x+5x-15=9
8x-15=9
8x=24
x=3
2解:8x-12=7x-7
x=5
3解:4x-4=3x+9-x+9
4x=2x+18+4
4x=2x+22
2x=22
x=11
4解:4x-[7-2x+2]=x+11
4x-[9-2x]=x+11
4x-9+2x=x+11
6x-9=x+11
5x=20
x=4
解題完了!
1題 x=3 , 2題 x=5 , 3題 x=11, 4題 x=4
8x-15=9
8x=24
x=3
2解:8x-12=7x-7
x=5
3解:4x-4=3x+9-x+9
4x=2x+18+4
4x=2x+22
2x=22
x=11
4解:4x-[7-2x+2]=x+11
4x-[9-2x]=x+11
4x-9+2x=x+11
6x-9=x+11
5x=20
x=4
解題完了!
1題 x=3 , 2題 x=5 , 3題 x=11, 4題 x=4
參考: me
收錄日期: 2021-04-23 22:32:00
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071028000051KK01156