(數學) 初中 數學問題困擾,請求高手解答~~

1)-8/2(16x-24y)
=-4(16x-24y)
=-64x+96y
Ax+By
A=-64
B=96
2)(7a)(6b+3c-9d)
=7a(6b)+7a(3c)-7a(9d)
=42ab+21ac-63ad
Kab+Mac+Nad
K=42
M=21
N=-63
3-10)冇未知數,計唔到
11)17/2+15/7+10
=119/14+30/14+140/14
=289/14
12)1/2+(-5/6)
=1/2-5/6
=3/6-5/6
=-2/6
13)-3/5+9-3/4)
=1/2-5/6
=3/6-5/6
=-2/6
=-1/3
14)-2/3-(-1/2)
=-2/3+1/2
=-4/6+3/6
=-1/6
15)2/3-1/4
=8/12-3/12
=5/12
16)1/5(1/4)
=1/5*1/4
=1/20
17)-(-1/3)^2
=-(1^2/3^2)
=-(1/9)
=-1/9
18)2(-1)-3(-3)
=-2+9
=7
19)3(-3)2-2(-2)2
=(-9)2+(4)2
=-18+8
=-8
20)5^2-45/3^2*5-8
=25-5*5-8
=25-17
=8
21)6*3-2^2/[2^2-(-3)]^2
=18-4/(4+3)^2
=14/49
22)10−2[−4(4−8)−5(9−1)]
=10-2(16-40)
=10+48
=58
23)2(−4)−4(−5) / 2−6
=-8+20/-4
=-12/4
=-3

2014-03-19 21:57:51 補充：
雖然我唔知4-10題係咩,但我試吓做
4) |120−324|
=120-324
=-204
5) |174−291| / |−11|.
=-117/-11
=117/11
6) ||−48|−|−19||.
=(-48+19)
=-19
7) −40 / |−40|.
=-40/-40
=1
8) |17− | −48||.
=17+48
=65
9) −15−|15−|−15||.
=-15-[15+15]
=-15-30
=-45
10) |−(−45−134)|
=-(-179)
=179

let me help you~

首先sorry第一、二題我唔明你想問咩...@@
其次，咩系|-123|...我只見過（-123）

11.17/2+15/7+10
=595/70+150/70+10
=745/70+10
=10 745/70
=20 45/70
=20 9/14

12.1/2+(-5/6)
=1/2-5/6
=3/6-5/6
=-1/3

13.-3/5+(-3/4)
=-3/5-3/4
=-12/20-15/20
=-27/20

14.-2/3-(-1/2)
=-2/3+1/2
=-4/6+3/6
=-1/6

15.2/3-1/4
=8/12-3/12
=5/12

16.1/5(1/4)
=1/5 x 1/4
=1/20

17.-(-1/3)^2
=1/3^2
=1/9

18.2(-1)-3(-3)
=-2-(-3)
=-2+3
=1

19.3(-3)2-2(-2)2
=-18-(-8)
=-10

20.5^2-45/3^2 x 5-8
=25-5 x 5-8
=-8

21.18-4/49
=17 45/49

22.10-(16-40)
=10-(-24)
=34

23.-8+10-6
=-4
註：其實你所講嘅 6‘⋅’3系唔系乘號？
同埋|-123|系唔系（-123）？

23
If the question is 2(−4)−4(−5)/(2−6)=?
2(−4)−4(−5)/(2−6)
= -8 - 4(-5)/(-4)
= -8 - 4(5)/(4)
= -8 - (4/4))(5)
= -8 - (1)(5)
= -8 - 5
= -13
If the question is 2(−4)−4(−5)/2 − 6=?
2(−4)−4(−5)/2 − 6
= -8 + 4(5)/2 - 6
= -8 + (4/2)(5) - 6
= -8 + (2)(5) - 6
= -8 + 10 - 6
= 2 - 6
= -4

2014-03-19 20:47:17 補充：
咩事???
咩事???
我中了招?....

2014-03-19 20:51:25 補充：
點解無啦啦我D答案無哂嘅??

唔通你講中招就係咁解...

2014-03-19 20:55:08 補充：
2014-03-19 20:34:36回答內容違規-50

2014-03-19 21:01:13 補充：
點了 贊助問題
又無左2分 -.-

2014-03-19 21:07:42 補充：
這便沒了52分 =[

HK~ 你中招了～

我都試過，很無辜～

2014-03-19 20:55:54 補充：
你 check check email，佢應該係冤枉你違規，而且已經扣左你 50 點。

>_<

係呢度，答題答得多的人相信個個都試過．．．

2014-03-19 20:57:44 補充：
請看看意見欄：

http://tw.knowledge.yahoo.com/question/question?qid=1614022500188

http://hk.knowledge.yahoo.com/question/question?qid=7014031900059