解方程 (六年級)

我中六...Haha...
我見啱啱有人有答案錯佐
我幫佢改下

1) 7x + 5–4x = 23
3x + 5 = 23
3x = 23-5
x = 6

2) y–5 = 42
y = 42+5
y=47

3) 3a–20 = 2a–10
3a - 2a = -10 + 20
a = 10

4) 4x–25 = 5 + 3x
4x - 3x = 5 + 25
x = 30

5) 3c + 15 = 4c–5
15+5=4c-3c
c=20

6) 7b–20 = 50 + 6b
7b - 6b = 50 + 20
b = 70

7) 40b + 18 = 30 + 39b
40b - 39b = 30 - 18
b = 12

8) 4x–20 = 5x–30
-20+30=5x-4x
x=10

9) 75–3b = 25–2b
75-25=-2b+3b
b=50

10) m + 6 = 2m–4
6+4=2m-m
m=10


其實好簡單 你花小小時間做可以幫你打好個數學底
希望幫到你

1)
7X+5-4X=23X
7X+5-4X+4X=23X+4X
7X+5=27
7X+5-7X=27-7X
5=20X
5/20=20X/5
0.25=X
x=0.25
ans=0.25

2)y-5=42
y=42+5
y=47
ans=47

3)
3a-20=2a-10a
3a=2a+10
a=10
ana=10

4)
4x-25=5+3x
x-25=5
x=30
ans=30

5)
3c+15=4c-5
3c+20=4c
c=20
ans=20

6)
7b-20=50+6b
b-20=50
b=70
ans=70

7)
40b+18=30+39b
b+18=30
b=12
ans=12

8)
4x-20=5x-30
4x=5x-10
x=10
ans=10

9)75-3b=25-2b
75-25=3b-2b
50=b
b=50
ans=50

10)
m+6=2m-4
6+4=2m-m
m=10
ans=10

1) 7x + 5 – 4x = 23
3x+5=23
3x=18
x=6
2) y – 5 = 42
y=42+5
y=47
3) 3a – 20 = 2a – 10
3a=2a+10
a=10
4) 4x – 25 = 5 + 3x
4x-25=3x+5
4x-20=3x
x=20
5) 3c + 15 = 4c – 5
3c=4c-20
c=20
6) 7b – 20 = 50 + 6b
7b-20=6b+50
7b=6b+30
b=30
7) 40b + 18 = 30 + 39b
40b+18=39b+30
40b=39b+12
b=12
8) 4x – 20 = 5x – 30
4x=5x-10
x=10
9) 75 – 3b = 25 – 2b
75-b=25+b
75-2b=25
b=25
10) m + 6 = 2m – 4
m=2m-10
m=10

2013-05-06 20:01:59 補充：
SOR 第9題錯了
9) 75 – 3b = 25 – 2b
75-25=3B-2B
50=B
B=50

2013-05-06 20:03:37 補充：
中6的,你第9題過程錯了,是3B-2B不是3B+2B

2013-05-06 20:06:22 補充：
SOR 中6的,我看不到你的-3B+2B 中的-,SOR

1.x=6
2.y=47
3.a=10
4.x=30
5.c=20
6.b=70
7.b=12
8.x=10
9.b=50
10.m=10
希望對你有幫助哟~

2013-05-05 13:51:10 補充：
才刚看到楼上是中六>︵<你一定不选我啦

1.6
2.47
3.10
4.30
5.20
6.70
7.12
8.10
9.50
10.2

1) 7x + 5–4x = 23
3x + 5 = 23
3x = 18
x = 6

2) y–5 = 42
y = 47

3) 3a–20 = 2a–10
3a - 2a = -10 + 20
a = 10

4) 4x–25 = 5 + 3x
4x - 3x = 5 + 25
x = 30

5) 3c + 15 = 4c–5
3c - 4c = -5 -15
-c = -20
c = 20

6) 7b–20 = 50 + 6b
7b - 6b = 50 + 20
b = 70

7) 40b + 18 = 30 + 39b
40b - 39b = 30 - 18
b = 12

8) 4x–20 = 5x–30
4x - 5x = -30 + 20
-x = -10
x = 10

9) 75–3b = 25–2b
-3b + 2b = 25 - 75
-b = -50
b = 50

10) m + 6 = 2m–4
m - 2m = -4 - 6
-m = -10
m = 10

2013-05-05 22:43:22 補充：
希望幫到你 :)

1. 1/4
2. -41/5
3.20/11
4. 30
5.15/-4
6. 70
7.12
8. 10
9. 50
10. 10

1.
x = 6

2.
y = 47

3.
a = 10

4.
x = 30

5
c = 20

6
b = 70

7
b = 12

8
x = 10

9
b = 50

10
m =2

我都係六年級學生....

10. -2(負數)

同一句,希望幫到你!

2013-05-03 22:07:29 補充：
2. -0.12

5. -3.75

我唔肯定~

1)0.25
2)5識
3)1.81818181818181............................
4)30
5)5識
6)70
7)12
8)10
9)50
10)5識
希望幫到你!