是咁的，有ｄ數學唔識做。
(請逐步例明所有步驟。)
1：7(d-3)-2d=9
2：10k-3(2-5k)=44
3：4(v-8)+3(v+7)=24
4：3(r+2)+2(r-4)=18
5：5(u-3)-2(u+5)=11
6 ：2(c+7)-4(c-3)=10
20點是辛勞者的禮物~~~
有d數學問題~20點!!
2013-05-28 4:26 am
回答 (2)
2013-05-28 4:52 am
✔ 最佳答案
1.7(d - 3) - 2d = 9
7d - 21 - 2d = 9
5d - 21 = 9
5d = 30
d = 6
2.
10k - 3(2 - 5k) = 44
10k - (6 - 15k) = 44
10k - 6 + 15k = 44
25k - 6 = 44
25k = 50
k = 2
3.
4(v - 8) + 3(v + 7) = 24
4v - 32 + 3v + 21 = 24
7v - 11 = 24
7v = 35
v = 5
4.
3(r + 2) + 2(r - 4) = 18
3r + 6 + 2r - 8 = 18
5r -2 = 18
5r = 20
r = 4
5.
5(u - 3) - 2(u + 5) = 11
5u - 15 - (2u + 10) = 11
5u - 15 - 2u - 10 = 11
3u - 25 = 11
3u = 36
u = 12
6.
2(c + 7) - 4(c - 3) = 10
2c + 14 - (4c - 12) = 10
2c + 14 - 4c + 12 = 10
-2c + 26 = 10
-2c = -16
c = 8
2013-05-29 1:44 am
1.
7(d - 3) - 2d = 9
7d - 21 - 2d = 9
5d - 21 = 9
5d = 30
d = 6
2.
10k - 3(2 - 5k) = 44
10k - (6 - 15k) = 44
10k - 6 + 15k = 44
25k - 6 = 44
25k = 50
k = 2
3.
4(v - 8) + 3(v + 7) = 24
4v - 32 + 3v + 21 = 24
7v - 11 = 24
7v = 35
v = 5
4.
3(r + 2) + 2(r - 4) = 18
3r + 6 + 2r - 8 = 18
5r -2 = 18
5r = 20
r = 4
5.
5(u - 3) - 2(u + 5) = 11
5u - 15 - (2u + 10) = 11
5u - 15 - 2u - 10 = 11
3u - 25 = 11
3u = 36
u = 12
6.
2(c + 7) - 4(c - 3) = 10
2c + 14 - (4c - 12) = 10
2c + 14 - 4c + 12 = 10
-2c + 26 = 10
-2c = -16
c = 8
7(d - 3) - 2d = 9
7d - 21 - 2d = 9
5d - 21 = 9
5d = 30
d = 6
2.
10k - 3(2 - 5k) = 44
10k - (6 - 15k) = 44
10k - 6 + 15k = 44
25k - 6 = 44
25k = 50
k = 2
3.
4(v - 8) + 3(v + 7) = 24
4v - 32 + 3v + 21 = 24
7v - 11 = 24
7v = 35
v = 5
4.
3(r + 2) + 2(r - 4) = 18
3r + 6 + 2r - 8 = 18
5r -2 = 18
5r = 20
r = 4
5.
5(u - 3) - 2(u + 5) = 11
5u - 15 - (2u + 10) = 11
5u - 15 - 2u - 10 = 11
3u - 25 = 11
3u = 36
u = 12
6.
2(c + 7) - 4(c - 3) = 10
2c + 14 - (4c - 12) = 10
2c + 14 - 4c + 12 = 10
-2c + 26 = 10
-2c = -16
c = 8
收錄日期: 2021-04-13 19:29:42
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20130527000051KK00277