幫我做數!!急..10分呀!!

1.-3x=-5
x=5/3
2.10-2k+5k+27=25
3k=-12
k=-4
3.6A+18=5A+20
A=2
4.7B-14=5B+20
2B=34
B=17

hope i did it right

2006-12-03 22:19:27 補充：
sorry,1.should be-3x=-15x=52.10-2k 6k 27=25k=-3

1. 24+2x=5x+9
24=5x+9-2x
24=3x+9
24-9=3x
15=3x
15/3=7x/3
5=x
x=5

2. 2(5-k)+3(2k+9)=25
10-2k+6k+27=25
10+27-2k+6k=25
37-8k=25
37=25+8k
37-25=8k
12=8k
12/8=8k/8
1.5=k
k=1.5

3. 6(A+3)+5(A+4)
=6A+18+5A+20
=6A+5A+18+20
=11A+38

4. 7(B-2)=5(B+4)
7B-14=5B+20
7B-5B-14=20
7B-5B=20+14
2B=34
2B/2=34/2
B=17

1. 3x=15
x=5
2. 10-2k+6k+27=25
4k+37=25
4k=-12
k=-3
3.6A+18=5A+20
A=2
4.7B-14=5B+20
2B=34
B=17

1. 24+2x=5x+9
24-9=5x-2x
15=3x
x=5

2. 2(5-k)+3(2k+9)=25
10-2k+6k+27=25
6k-2k=25-27-10
4k=-12
k=-3

3. 6(A+3)+5(A+4)
what do you want to ask?

4. 7(B-2)=5(B+4)
7B-14=5B+20
7B-5B=20+14
2B=34
B=17

1.
3x=15
x=5

2.
10-2k+6k+27=25
4k=-12
k= -3

3.
6A+18=5A+20
A=2

4.
7B-14=5B+20
2B=34
B=17

1.x=5

1.-13*9
2.-3
3.
4.17