數學問題 F.1

1)16= -40p - 64
-40p=80
p=-2

2)35+15q+12=2
47+15q=2
15q=-45
q=3

3) -4q=12
q=-3

4)1.6p=8
p=5

2007-10-07 00:31:42 補充：
2)35 15q 12=247 15q=215q=-45q=-3 先真

16=-8(5p+8)
16=(-40p)+(-64)
16+64=(-40p)+(-64)+(+64)
80=-40p
80/-40=-40p/-40
-2=p
p=-2

5(7+3Q)+12=2
5(7+3Q)+12-12=2-12
35+3Q=-10
35+3Q-35=-10-35
3Q=-45
3Q/3=-45/3
Q=15

1)16=-8(5p+8)
-2 = 5P+8
-10 = 5P
P = -2

2) 5(7+3Q)+12=2
5(7+3Q) = -10
7+3Q = -2
3Q = -9
Q = -3

3) 7Q=15+11Q-3
-4Q= 12
Q = -3

4)2p+1=0.4p+9
1.6P= 8
P = 5

1)16=-8(5p+8)
16+8=-8(5p+8)+8
16+8-8=5p+8-8
16+8-8/5=5p/5
16=p
p=16

2)5(7+3Q)+12=2
5(7+3Q)+12-12=2-12
35+15Q=-10
35+15Q-35=-10-35
15Q/15=-10-35/15
Q=-10-35/15

3)7Q=15+11Q-3
7Q-11Q=15+11Q-3-11Q
Q(7-11)=15-3
Q(7-11)/(7-11)=15-3/7-11
Q=15-3/7-11

4)2p+1=0.4p+9
2p+1-1=0.4p+9-1
2p-0.4p=0.4p+9-1-0.4p
p(2-0.4)=9-1
p(2-0.4)/(2-0.4)=9-1/(2-0.4)
p=9-1/(2-0.4)

1. 16=8(5p+8)
16=40p+64
40p=40
p=10
2. 5(7+3Q)+12=2
35+15Q+12=2
15Q=-45
Q=-5
3. 7Q=15+11Q-3
-4Q=12
Q=-3
4.2p+1=0.4p+9
1.6p=8
p=5

16=-8(5p+8)
16=-40p-64
16+64=-40p
80=-40p
-2=p
0=-2



5(7+3Q)+12=2
35+15Q+12=2
15Q=2-35-12
15Q=-45
Q=-3




7Q=15+11Q-3
7Q=15-3+11Q
7Q-11Q=12
-4Q=12
Q=-3





2p+1=0.4p+9
2p-0.4p=9-1
1.6p=8
p=5

1. 16=8(5p+8)
16=40p+64
40p=40
p=10
2. 5(7+3Q)+12=2
35+15Q+12=2
15Q=-45
Q=-5
3. 7Q=15+11Q-3
-4Q=12
Q=-3
4.2p+1=0.4p+9
1.6p=8
p=5

1. 16 = -8(5p+8)
-2 = 5p+8
5p = -10
p = -2


2. 5(7+3Q)+12 = 2
5(7+3Q) = -10
7+3Q = -2
3Q = -9
Q = -3


3. 7Q = 15+11Q-3
-4Q = 12
Q = -3


4. 2p+1 = 0.4p+9
1.6p = 8
p = 5


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