唔識做呀!

2007-11-08 5:35 am
我有六題mux唔識做呀!幫下手!

5(x+8)﹣6(7﹣x)=42

7﹝2r=(4﹣3r)﹞=﹣14

2﹝1-0.25(3-4c)﹞=1+c

a 2a-5
- -1 = -
8 2

2(1-m)
m- - =8
5

回答 (6)

2007-11-09 2:07 am
一, 5(x+8)﹣6(7﹣x)=42
5x+40-42+6x=42
11x-2x=42
11x=44
x=4

二, 7﹝2r=(4﹣3r)﹞=﹣14
7(2r-4+3r)=-14
7(5r-4)=-14
35r-28=-14
35r=14
r=14/35
r=2/7

三, 2﹝1-0.25(3-4c)﹞=1+c
2(0.25+c)=1+c
0.5+2c=1+c
c+0.5=1
c=0.5

四, a 2a-5
- -1 = -
8 2
(a/8)-1=(2a-5)/2
a-8=4(2a-5)
a-8=8a-20
12=7a
a=7/12


五, 2(1-m)
m- - =8
5
m-2(1-m)/5=8
5m-(2-2m)=40
5m-2+2m=40
7m=42
m=6
參考: me
2007-11-09 12:48 am
-------------5(x+8)﹣6(7﹣x)=42

5x+40-42+6x=42

--------------------------11x=44

--------------------------------x=4

7﹝2r=(4﹣3r)﹞=﹣14 <<

2007-11-08 16:49:35 補充:
-------------5(x+8)﹣6(7﹣x)=425x+40-42+6x=42--------------------------11x=44--------------------------------x=4

2007-11-08 16:51:26 補充:
7﹝2r=(4﹣3r)﹞=﹣14 <<

2007-11-08 16:51:44 補充:
if it is a +,that will be:7〔2r+(4-3r)〕=-14-14r+7〔4-3r)=-2--14r+28-21r=-2----(-7r)+28=-2-------(-7r〕=26-----------r=-26/7-----------r=-3 5/6-----負3+5/6

2007-11-08 16:52:04 補充:
2﹝1-0.25(3-4c)﹞=1+c2〔1-(3-4c)/4〕=1+c2-3/2+2c=1+cc=1+3/2-2=1/2=0.5(a/8)-1=(2a-5)/2-------------a/8=(2a-5)/2 +1---------------a/8=a-2.5+1----a/8=a-1.5------a=(a-1.5)*8------a=8a-12---a-8a=12--(-7a)=12------a=-12/7------a=-1 5/7-----負(1+5/7)

2007-11-08 16:52:21 補充:
m-2(1-m)/5=85m-(2-2m)=405m-2+2m=407m=42m=6
參考: memememe
2007-11-08 6:21 am
1. 5(x+8)- 6(7- x)=42
(5x+40)- (42- 6x)=42
5x+40- 42+6x- 40=42-40
11x- 42+42=2+42
11x 44
──=──
11 11
x=4

2. 7[2r- (4- 3r)]=- 14
7(2r- 4+3r) -14
─────=──
7 7
2r- 4+3r=-2
5r- 4+4=-2+4
5r 2
─=─
5 5
2
r=─ or 0.4
5

3. 2[1- 0.25(3- 4c)]=1+c
2(1- 0.75+c) 1+c
──────=──
2 2
c 1 c c
0.25+c- ─=─+─ - ─
2 2 2 2
0.25+0.5c- 0.25=0.5- 0.25
0.5c 0.25
───=──
0.5 0.5
c=0.5
其他:I DON'T KNOW.
2007-11-08 5:58 am
5(x+8)﹣6(7﹣x)=42
5x + 40 - 42 + 6x = 42
11x = 44
x = 4

7﹝2r=(4﹣3r)﹞=﹣14 是否打錯字?

2﹝1-0.25(3-4c)﹞=1+c
2( 1-0.75+c) = 1+c
2(0.25 + c) = 1+c
0.5 + 2c = 1+c
c = 0.5

下面看不明, sorry
a 2a-5
- -1 = -
8 2

2(1-m)
m- - =8
5
2007-11-08 5:54 am
a. 5x+40-42+6x=42
11x-2=42
x=4
b你可能打錯了

c.2-0.5(3-4c)=-14
2-1.5+2c=-14
2c=-14.5
c=-7.25

d看不明

(e)題



2(1-m)
m- -----------=8
5

5m-2(1-m)=40
5m-2+2m=40
7m=42
m=6
參考: 我自己的,如困你有的唔明的話,上我msn [email protected]
2007-11-08 5:40 am
0215448715848945879471


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