2.-2(y-3)=-3(6-2y)
3.2(z+1)=3(z-4)
4.2(8n-10)=9n+8
更新1:
(要列式)
maths,,,,,,,,,,,,
回答 (2)
2010-10-27 9:38 pm
✔ 最佳答案
1.2x=3(1-x)-(x+1)
2x = 3-3x-x-1
2x+3x+x = 3-1
6x = 2
x = 2/6
x = 1/3
2.
-2(y-3)=-3(6-2y)
-2y+6 = -18+6y
6+18 = 6y+2y
24 = 8y
y = 24/8
y = 3
3.
2(z+1)=3(z-4)
2z+2 = 3z-12
2+12 = 3z-2z
z = 14
4.
2(8n-10)=9n+8
16n-20 = 9n+8
16n-9n = 8+20
7n = 28
n =28/7
n = 4
2010-10-27 6:19 pm
1. 2x = 3(1-x)-(x+1)
2x = 3-3x-x-1
2x = 2-4x
6x = 2
x = 1/3
2. -2(y-3) = -3(6-2y)
-2y+6 = -18+6y
24 = 8y
3 = y
3. 2(z+1) = 3(z-4)
2z + 2 = 3z - 12
14 = z
4. 2(8n-10) = 9n+8
16n -20 = 9n +8
7n = 28
n = 4
2x = 3-3x-x-1
2x = 2-4x
6x = 2
x = 1/3
2. -2(y-3) = -3(6-2y)
-2y+6 = -18+6y
24 = 8y
3 = y
3. 2(z+1) = 3(z-4)
2z + 2 = 3z - 12
14 = z
4. 2(8n-10) = 9n+8
16n -20 = 9n +8
7n = 28
n = 4
收錄日期: 2021-04-19 23:27:19
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20101027000051KK00261