中一題目 請解答 急 急 急

2006-11-23 6:30 am
1) 4x-2[(8-3x)-(6+2x)]=10

2) 3k-4=k+6

3 )5(m-4)+3m=7-m

4) 4(3a-1)-3(2a-9)=17

5) 2[7x-(8x-3)]=5(x-3)

回答 (7)

2006-11-23 6:36 am
✔ 最佳答案
1) 4x-2[8-3x-6-2x]=10
4x-2[-5x+2]=10
4x+10x-4=10
14x=14
x=1

2) 3k-4=k+6
2k=10
k=5

3) 5(m-4)+3m=7-m
5m-20+3m=7-m
9m=27
m=3

4) 4(3a-1)-3(2a-9)=17
12a-4-6a+27=17
6a=-6
a=-1

5) 2[7x-(8x-3)]=5(x-3)
2[-x+3]=5x-15
-2x+6=5x-15
7x=21
x=3
參考: 自己
2006-11-23 3:38 pm
Q1
4x-2[(8-3x)-(6+2x)]=10
4x-2(8-3x-6-2x)=10
4x-16+6x+12+4x=10
4x+6x+4x=10+16-12
14x=14
x=1

Q2
3k-4=k+6
3k-k=6+4
2k=10
k=5

Q3
5(m-4)+3m=7-m
5m-20+3m=7-m
5m+3m+m=7+20
9m=27
m=3

Q4
4(3a-1)-3(2a-9)=17
12a-4-6a+27=17
12a-6a=17+4-27
6a=-6
a=-1

Q5
2[7x-(8x-3)]=5(x-3)
2(7x-8x+3)=5x-15
2(-x+3)=5x-15
-2x+6=5x-15
-2x-5x=-15-6
-7x=-21
x=3
2006-11-23 9:33 am
1) 4x-2[(8-3x)-(6+2x)]=10
4x-2(8-3x-6-2x)=10
4x-16+6x+12+4x=10
4x+6x+4x=10+16-12
14x=14
x=1

2) 3k-4=k+6
3k-k=6+4
2k=10
k=5

3 )5(m-4)+3m=7-m
5m-20+3m=7-m
5m+3m+m=7+20
9m=27
m=3

4) 4(3a-1)-3(2a-9)=17
12a-4-6a+27=17
12a-6a=17+4-27
6a=-6
a=-1

5) 2[7x-(8x-3)]=5(x-3)
2(7x-8x+3)=5x-15
14x-16x+6=5x-15
14x-16x-5x=-15-6
-7x=-21
x=3
2006-11-23 7:11 am
1) 4x-2[(8-3x)-(6+2x)]=10
唔識
2) 3k-4=k+6
2k =10
k =5
3) 5(m-4)+3m =7-m
5m-20+3m =7-m
8m-20 =7-m
9m =27
m =3
4) 4(3a-1)-3(2a-9)=17
12a-4-6a+27 =17
6a+23 =17
6a =-6
a =-1
5) 2[7x-(8x-3)]=5(x-3)
2(7x-8x+3)=5x-15
14x-16x+6 =5x-15
-7x =-21
x =3

2006-11-22 23:13:25 補充:
1) 4x-2[(8-3x)-(6+2x)]=10 4x-2(-5x+2)=10 4x+10x-4 =10 14x =14 x =1我識la= =
參考: 自己
2006-11-23 6:53 am
這應該是功課裡的題目吧! 要自己做的哦!
不過我也可以教你做的...
1) 先把[括號]裡的(小括號)拿去 "減號要乘進6+2x裡",解決了[括號]裡的加減混算,再乘2,把有x的放在一面。之後自己做。
2) 把有k的放在一面,數字放另一面。之後再打混戰。
3) 把5乘進(m-4),混戰後再把有m的放一面。之後自己打戰。
4) 4(3a-1)=4(3a)-4(1)
-3(2a-9)=(-3)(2a)+(-3)(-9)=(-6a)+27
懂了吧...
5) refer to 第一題。

趕得及幫你嗎??
參考: 我自己的廢話
2006-11-23 6:49 am
1) 4x - 2(8 - 3x - 6 -2X ) = 10
4x -2( 2 - 5x) = 10
4x - 4 + 10x = 10
4x + 10x = 10 + 4
14x = 14
x =14/14
x =1


2) 3k - k = 6 + 4
2k = 10
k = 10/2
k = 5


3) 5m - 20 +3m = 7-m
5m +3m + m =7 +20
9m = 27
m = 27/9
m=3

4) 12a - 4 - 6a + 27 =17
12a - 6a = 17 - 27 + 4
6a = -6
a = -6/6
a = -1

5) 2( 7x - 8x + 3) = 5x - 15
14x - 16x + 6 = 5x - 15
6 + 15 = 5x -14x +16x
21 = 7x
x = 21/7
x = 3
2006-11-23 6:48 am
2)3k-k=6+4
k=5
3)5m-20+3m=7-m
9m=27
m=3
4)12a-4-6a+27=17
6a+23=17
a=-1
第1&5條不肯定,因此不回答。sorry!
參考: 本人


收錄日期: 2021-04-24 08:26:19
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20061122000051KK04874

檢視 Wayback Machine 備份