有數學唔識做？？

1.) 4(b+1)-3(b-1)=1
4b+4-3b+3=1
b+7=1
b=-6
2.)7(x-1)-5(2-x)=3=18y
i.)7(x-1)-5(2-x)=3
7x-7-10+5x=3
12x=20
x=20/12
x=5/3
ii.)3=18y
y=3/18
y=1/6
3.) (s+4)+6(1-s)=9
s+4+6-6s=9
-5s=9-10
-5s=-1
s=1/5
4.) 6(x-3)-4(2x-5)=7
6x-18-8x+20=7
-2x+2=7
-2X=5
X=-5/2

1.4(b+1)-3(b-1)=1
(4b+4)-(3b-3)=1
4b+4-3b+3=1
b+7=1
b=1-7
=-6

2.7(x-1)-5(2-x)=3
7x-7-10+5x=3
12x-17=3
12x=3+17
x=20÷12
=5/3

18y=3
y=1/6

3.(s+4)+6(1-s)=9
s+4+6-6s=9
-5x+10=9
-5x=-1
x=1/5

4.6(x-3)-4(2x-5)=7
6x-3-8x+20=7
-3x=7-17
x=10/3

1. 4(b+1)-3(b-1)=1
4b+4-3b+3 =1
4b-3b+4+3 =1
b+7 =1
b=6

2.7(x-1)-5(2-x)=3..................=18y
7x-7-10+5x =3
7x+5x-7-10 =3
12x-17 =3
x =1.67
18y=3
y=0.167

3.(s+4)+6(1-s)=9
s+4+6-6s =9
-5s+10 =9
-5s =-1
s=0.2

4.6(x-3)-4(2x-5)=7
6x-18-8x+20 =7
-2x+2 =7
-2x =5
x=-2.5

2007-06-03 20:20:57 補充：
1. 4(b+1)-3(b-1)=14b+4-3b+3 =14b-3b+4+3 =1b+7 =1b=-6 第一問題打錯左