請大家教我這幾方程(要步驟+答案)

第一題有問題,請查查有沒有出錯~
2)x+1/2x=3
(1+1/2)x=3
x=3/(3/2)
x=2

3)5/2y-y=6
(5/2-1)y=6
y=6/(3/2)
y=4

4)5/4t+3=3/4t
5/4t-3/4t=-3
(5/4-3/4)t=-3
(1/2)t=-3
t=-3/(1/2)
t=(-6)

5)2y+1/5=3-y
2y+y=3-1/5
3y=14/5
y=(14/5)/3
y=14/15

6)8x+3x-7/2=6
11x-7/2=6
11x=6+7/2
11x=19/2
x=(19/2)/11
x=19/22

7)3/4y=1-1/2y
(3/4)y+(1/2)y=1
(5/4)y=1
y=1/(5/4)
y=4/5

8)25/3-1=s+2/5
22/3-2/5=s
s=6又14/15

9)r+6/3=r/2+7/6
r-r/2+2=7/6
r/2+2=7/6
r/2=7/6-2
r/2=-5/6
r=(-5/3)

仲有...
1/2
係二分之一
(2/3)t=(2t)/3
係三分之二*t
姐係三分之2t

1/x
係x分之一
x/2
係二份之x

1.x-6=x-3/4
x-x=-3/4+6
0=6,3/4#
2.x+1/2x=3
1,1/2x =3
3/2x=3
x=3x2/3
x=2#
3.5/2y-y=6
y-y=6x2/5
0 =2,2/5#
4.5/4t+3=3/4t
5/4t-3/4t=-3
1/2t=-3
t=-3x2
t=-6#
6.8x+3x-7/2=6
12x=6+7/2
12x=19/2
12x=19/2x1/12
x=19/24#
7. 3/4y=1-1/2y
3/4y+1/2y=1
5/4y=1
y=1x4/5
y=4/5#
8. 25/3-1=s+2/5
25/3-1-2/5=s
6,14/15=s
9.r+6/3=r/2+7/6
6/3-7/6=r/2-r
5/6=r/2-r
5/6x2=r-r
1,2/3=0#