數學的問題

1. 7x = 28
x = 28/7
x = 4
2. p = 4 + 12
p = 16
3. 5p - 4p = 9
p = 9
4. a = 12x3
a = 36
5. 0.6a = 10
a = 10/0.6
a = 16.67......或50/3
6. m - 1 = 5/2
m = 2.5 + 1
m = 3.5
7. m = 3 - 3/4
m = 12/4 - 3/4
m = 9/4 or 2.25
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2007-07-20 22:58:59 補充：
好耐...唔係勁－　－依家就唔小心嚕~呵

1. 2x+5x=28
　x=4

2. p-12=4
　p=16

3. 5p=4p+9
　p=1

4. a/3=12
　a=36

5. 0.6a=10
　16.67(取自小數點後一個位)
　
6. 2(m-1)=5
　m=3

7. m+3/4=3
　m=9/4 or2.25

1. 2x+5x=28
7x=28
x=28/7
x=4

2. p-12=4
p=4+12
p=16

3. 5p=4p+9
5p-4p=9
p=9

4. a/3=12
a=12*3
a=36

5. 0.6a=10
a=10/0.6
a=16又3分之2

6. 2(m-1)=5
2m-2=5
2m=7
m=7/2
m=3.5

7. m+3/4=3
m=3-3/4
m=2.25

應該全部都岩嫁啦…

1. 4
2. 16
3. 9
4. 36
5. 6
6. 3.5
7. 2,1/4

1. 2x + 5x = 28
7x = 28
x = 28/7 = 4

2. p - 12 = 4
p = 12 + 4 =16

3. 5p = 4p + 9
5p - 4p = 9
p=9

4. a / 3 = 12
a = 12 * 3 = 36

5. 0.6 a = 10
a = 10 / 0.6 = 100/6 = 50/3 (約16.66666)

6. 2 (m - 1) = 5
m - 1 = 5/2
m = 5/2 + 1 = 7/2 = 3.5

7. m + 3/4 = 3
m = 3 - 3/4 = 9/4 = 2.25

1. 2x+5x=28

7x = 28

x = 4

2.p-12=4

p = 16

3.5p=4p+9

5p - 4p = 9

p = 9


4.a/3=12

a = 3 * 12 = 36

5. 0.6a=10

a = 10/0.6 = 16 2/3

6. 2(m-1)=5

m - 1 = 5/2 = 2.5

m = 2.5 + 1 = 3.5

7. m+3/4=3

m = 3 - 3/4 = 9/4

1. 2x+5x=28
7x=28
x=4

2. p-12=4
p=12+4
p=16

3. 5p=4p+9
5p-4p=9
p=9

4. a/3=12
a=12x3
a=36

5. 0.6a=10
a=10/0.6
a=16.6

6. 2(m-1)=5
2m-1=5
2m=5+1
2m=6
m=3

7. m+3/4=3
m=3-3/4
m=2又4/1