f1數學問題

8w-5-2w=10
6w-5=10
6w=15
w=2又1/2

0=f+80+6f+4
0=7f+84
-84=7f
f= -12

0.3k+0.2k+5=-15
0.5k= -20
k= 0.75

15=5(2a-3)
15= 10a-15
a=3

6-3(4+7b)=36
6-12-21b=36
21b= -42
b = -2

Q1:
8w - 5 - 2w = 10
6w = 15
w = 15/6
w = 5/2

Q2:
f + 80 + 6f + 4 = 0
7f + 84 = 0
7f = -84
f = -84/7
f = -12

Q3:
0.3k + 0.2k + 5 = -15
0.5k = -20
k = -20/0.5
k = -40

Q4:
5 (2a - 3) = 15
10a - 15 = 15
10a = 30
a = 3

Q5:
6 - 3 (4 + 7b) = 36
6 - 12 - 21b = 36
21b = 6 - 12 - 36
21b = -42
b = -42/21
b = -2

1. 8w-5-2w=10
6w-5=10
6w=10+5
6w=15
w=15/6
w=5/2
w=2/1/2

2. 0=f+80+6f+4
0=7f+84
-84=7f
-12=f
f=-12

3: 15=5(2a-3)
15/5=2a-3
3=2a-3
6=2a
6/2=a
3=a
a=3

4: 6-3(4+7b)=36
6-12-21b=36
-6-21b=36
21b=36+6
21b=42
b=2

1. 8w-5-2w=10
6w-5=10
6w=15
w=2.5
2. 0=f+80+6f+4
7f+84=0
7f=-84
f=-12
4. 15=5(2a-3)
2a-3=3
2a=0
a=0
5. 6-3(4+7b)=36
36=6-3(4+7b)
36+3(4+7b)=6
3(4+7b)=-30
4+7b=-10
7b=-14
b=-2

1. 8w-5-2w=10
6w-5=10
6w=10+5
6w=15
w=15/6
w=5/2
w=2/1/2

2. 0=f+80+6f+4
0=7f+84
-84=7f
-12=f
f=-12

3: 15=5(2a-3)
15/5=2a-3
3=2a-3
6=2a
6/2=a
3=a
a=3

4: 6-3(4+7b)=36
6-12-21b=36
-6-21b=36
21b=36+6
21b=42
b=2

8w-5-2w = 10
6w-5 = 10
6w = 15
w = 6/15

0 = f+80+6f+4
0 = 7f+84
7f = -84
f = -84/7 (-12)

0.3k+0.2k+5= -15
0.5k+5 = -15
0.5k = -20
k = -20/0.5 (-10)

15 = 5(2a-3)
3 = 2a-3
6 = 2a
a = 3

6-3(4+7b) = 36
-3(4+7b) = 30
4+7b = -10
7b = -14
b = -2

1.) 8w-5-2w=10
8w-2w-5=10
6w-5+5=10+5
6w=15
6w/6=15/6

2.) 0=f+80+6f+4
0=f+6f+80+4
0=7f+84
0-84=7f+84-84
-84/7=7f/7
f = -12

3.) 0.3k+0.2k+5= -15
0.5k+5-5=-15-5
0.5k/0.5=-20/0.5
k = -40

3.) 15=5(2a-3)
15=10a-15
30/10=10a/10
a=3

4.) 6-3(4+7b)=36
6-12+21b=36
-6+21b=36
21b/ 21 =42/21
b = 2

希望可以幫到你^3^

2007-10-08 17:20:47 補充：
我果個有齊全部step!

8w-5-2w=10
6w-5=10
6w=15
w=2.5

0=f+80+6f+4
0=7f+84
-84=7f
f= -12

0.3k+0.2k+5=-15
0.5k= -20
k= 0.75

15=5(2a-3)
15= 10a-15
a=3

6-3(4+7b)=36
6-12-21b=36
21b= -42
b = -2

8w-5-2w=10
8w-2w=10+5
6w=15
w=15/6

0=f+80+6f+4
6f+f+84=0
7f= -84
f= -12

0.3k+0.2k+5= -15
0.5k= -15-5
0.5k= -20
k= -40

15=5(2a-3)
15/5=2a-3
2a-3=3
2a=6
a=3

6-3(4+7b)=36
-3(4+7b)=30
4+7b= -10
7b= -14
b= -2