方程式!!!

2007-10-04 4:50 am





1.-20=5(6c+14)

2.3(b-2)=b+18
3.5(7+4p)+11=6
列式,一步不能少,help~help!!!



回答 (11)

2007-10-04 4:56 am
✔ 最佳答案
1.
-20=5(6c+14)
-20=30c+70
-90=30c
c=-3

2.
3(b-2)=b+18
3b-6=b+18
2b=24
b=12

3.
5(7+4p)+11=6
35+20p+11=6
20p+46=6
20p=-40
p=-2

2007-10-03 20:57:04 補充:
上面果位..你計緊d乜?
參考: ME!
2007-10-05 5:43 pm
1.
 -20=5(6c+14)

 -20=30c+70

 -20-70=30c+70-70(兩邊同時減70)

 -90=30c

 -90/30=30c/30 (兩邊同時除30)

 - 3= c

即c= - 3

2.
 3(b-2)=b+18

 3b-6=b+18

 3b-b=18+6(把相同的數放在一起,才進行運算)

 2b=24

 2b/2=24/2 (兩邊同時除2)

 b=12

3.
 5(7+4p)+11=6

 35+20p+11=6

 46+20p=6

 46+20p- 46=6- 46(兩邊同時減46)

 20p= - 40

 20p/20= - 40/20 (兩邊同時除20)

 p= - 2
參考: 自己
2007-10-05 1:30 am
-20=5(6c+14)


(1.)-20=30c+70


-20+70=30c


50=30c


50/30=c


1 20/30=c


1 2/3=c


2.]3(b-2)=b+18


3b-6=b+18


3b-b-6=18


2b-6=18


2b=18+6


2b=24


b=24/2


b=12


3.]5(7+4p)+11=6


35+20p+11=6


46+20p=6


20p=6-46


20p=-40


p=-40/2


p=-20
2007-10-04 5:10 am
1. .-20=5(6c+14)
-20=30c+70
-90=30c
-3=c
c=-3

2. 3(b-2)=b+18
3b-6=b+18
2b=24
b=12

3. 5(7+4p)+11=6
35+20p+11=6
20p=-40
p=-2
參考: 自己
2007-10-04 5:09 am
1.
-20=5(6c+14)
-20=30c+70
-30c=70+20
-30c=90
c= -3

2.
3(b-2)=b+18
3b-6=b+18
3b-b=18+6
2b=24
b=12

3.
5(7+4p)+11=6
35+20p+11=6
20p=6-35-11
20p= -40
p= -2
參考: myself
2007-10-04 5:07 am
1)-20 = 5(6c+14)
-20/5= 6c+14
-4 = 6c+14
-18 = 6c
c = (-3)

2)3(b-2) =b+18
(b-2) =(b18)/3
b-2 =(b/3)+(18/3)
b-2 = (b/3) +6
b-2-6 =(b/3)
b-8 =(b/3)
(b-8)*3=b
3b-24 =b
3b-b =24
2b =24
b =12

3)5(7+4p)+11=6
5(7+4p)=6-11
5(7+4p)=(-5)
(7+4p)=(-1)
4p=(-8)
p=(-2)

哈哈,夠長啦...
參考: ^-^自己
2007-10-04 5:02 am
1. 5(6c+14)=-20
6c+14=(-20)/5
6c+14=-4
6c=-4-14
6c=-18
c=-3

2. 3(b-2)=b+18
3b-6=b+18
3b-b=18+6
2b=24
b=24/2
b=12

3. 5(7+4p)+11=6
35+20p+11=6
20p+46=6
20p=6-46
20p=-40
p=(-40)/20
p=-2



希望幫到你啦!
參考: 自我計算
2007-10-04 4:58 am
1. -20=30c+70
-20-70=30c
-90=30c
c=-3
2. 3b-6=b+18
3b-b=18+6
2b=24
b=12
3. 35+20p+11=6
20p=6-35-11
20p=-40
p=-2
2007-10-04 4:57 am
-20=5(6c+14)
-20=30c+70
-20+70=30c
50=30c
30c=50
c=30/50
c=6/25
~x/x=分數
3(b-2)=b+18
3b-6=b+18
3b-b=18+6
2b=24
b=12
5(7+4p)+11=6
35+20p+11=6
46+20p=6
20p=6-46
20p=-40
p=-2

2007-10-03 21:00:13 補充:
sorry,1)-20=5(6c 14)-20=30c 70-30c=70 20-30c=9030c=-90c=-3
2007-10-04 4:57 am
1 ).-20=5(6c+14)
-20=30C+70
-30C=90
-c=-3
3=C
c=3

2 ).3(b-2)=b+18
3B-6=b+18
2b=24
b=12

3 )5(7+4p)+11=6
35+20p+11=6
40=-20p
-2=-P
p=2
參考: ME
2007-10-04 4:56 am
1
-20=5(6c+14)
-20=30c+70
30c=-90
c=-3

2
3(b-2)=b+18
3b-6=b+18
2b=24
b=12

3
5(7+4p)+11=6
35+20p+11=6
20p+46=6
20p=-40
p=-2


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