我有數唔識請教教我(需步驟)今晚9:00前要

1. t/4+t/4=1

2t/4=1
t/2=1
t=1*2
t=2

2.x/5-2x/15=3

3x/15-2x/15=3
x/15=3
x=3*15
x=45

3.k/30+5=k/10

k/30+5=3k/30
k/30-3k/30=-5
-2k/30=-5
-2k=-5*30
k=-150/-2
k=75

4.y/6=6-4y/3

y/6=6-8y/6
y/6+8y/6=6
9y/6=6
9y=6*6
y=36/9
y=4

5.3(x-0.5)-2(x-4.5)=7

(3x-1.5)-(2x-9)=7
3x-1.5=7+(2x-9)
3x=7+(2x-9)+1.5
3x=8.5+(2x-9)
3x-8.5=2x-9
3x-8.5+9=2x
3x+0.5=2x
3x+0.5-2x=0
x=-0.5

6.3[2(2-y)-3y]=24

2(2-y)-3y=24/3
2(2-y)=8+3y
2-y=(8+3y)*2
-y=16+6y-2
-y-6y=16-2
-7y=14
y=14/-7
y=-2

7.9(2a-1)=3[4(1+2a)-5]-8a

18a-9=3(4+8a-5)-8a
18a-9=12+24a-15-8a
18a-9=16a-3
18a-9+3=16a
18a-6=16a
18a-16a=6
2a=6
a=6/2
a=3

1. t/4 + t/4 = 1
2 (t/4) = 1
2t/4 = 1
2t = 1 x 4 = 4
t = 4/2
t = 2

2. x/5 - 2x/15 = 3
3x/15 - 2x/15 = 3
x/15 = 3
x = 45

3. k/30 + 5 = k/10
k/30 +5 = 3k/30
5 = 3k/30 - k/30
5 = 2k/30
5 x 30 = 2k
2k = 150
k = 75

4. y/6 = 6 - 4y/3
y/6 = 6 - 8y/6
y/6 + 8y/6 = 6
9y/6 = 6
9y = 6 x 6 = 36
y = 36/9 = 4

5. 3(x-0.5) - 2(x-4.5) = 7
(3x -1.5) - (2x - 9) = 7
3x - 1.5 - 2x + 9 = 7
x + 7.5 = 7
x = -0.5

6. 6[2(2-y)-3y] = 24
6[4 - 2y - 3y] = 24
4 - 2y - 3y = 24/6 = 4
4 - 5y = 4
4 - 4 = 5y
5y = 0
y = 0

7. 9(2a-1) = 3[4(1-2a)-5]-8a
18a -9 = 3[4-8a-5] - 8a
18a - 9 = 12 - 24a - 15- 8a
18a + 24a + 8a = 12 - 15 + 9
50a = 6
a = 0.12

1. t/4 + t/4 =1
2t/4=1
t=1/0.5(2/4)
t=2
2. x/5 - 2x/15=3
3x/15-2x/15=3
x/15=3
x=45
3. k/30 +5 =k/10
5=k/10-k/30
5=3k/30-k/30
5=2k/30
5*2/30=k
k=75
4. y/6 = 6 - 4y/3
y/6+4y/3=6
y/6+8y/6=6
9y/6=6
y=6*(6/9)
y=4
5. 3(x-0.5)-2(x-4.5)=7
3x-1.5-2x+9=7
x+7.5=7
x=7-7.5
x=-0.5
6. 6[2(2-y)-3y]=24
2(2-y)-3y=4
4-2y-3y=4
0=5y
y=0
7. 9(2a-1)=3[4(1+2a)-5]-8a
18a-9=3(4+8a-5)-8a
18a-9=12+24a-15-8a
18a-9=16a-3
18a-16a=9-3
2a=6
a=3
Is it correct?

1. t/4 + t/4 = 1
2 (t/4) = 1
2t/4 = 1
2t = 1 x 4 = 4
t = 4/2
t = 2
2. x/5 - 2x/15 = 3
3x/15 - 2x/15 = 3
x/15 = 3
x = 3 x 15 = 45
3. k/30 + 5 = k/10
k/30 +5 = 3k/30
5 = 3k/30 - k/30
5 = 2k/30
5 x 30 = 2k
2k = 150
k = 75
4. y/6 = 6 - 4y/3
y/6 = 6 - 8y/6
y/6 + 8y/6 = 6
9y/6 = 6
9y = 6 x 6 = 36
y = 36/9 = 4
5. 3(x-0.5) - 2(x-4.5) = 7
(3x -1.5) - (2x - 9) = 7
3x - 1.5 - 2x + 9 = 7
x + 7.5 = 7
x = 7 - 7.5 = -0.5
6. 6[2(2-y)-3y] = 24
6[4 - 2y - 3y] = 24
4 - 2y - 3y = 24/6 = 4
4 - 5y = 4
4 - 4 = 5y
5y = 0
y = 0
7. 9(2a-1) = 3[4(1-2a)-5]-8a
18a -9 = 3[4-8a-5] - 8a
18a - 9 = 12 - 24a - 15- 8a
18a + 24a + 8a = 12 - 15 + 9
50a = 6
a = 6/50 = 3/25 = 0.12

1。t/4+t/4=1
2t/4=1
2t=1乘4
t=4

2。x/5-2x/15=3
3x/15-2x/15=3
x/15=3
x=15乘3
x=45

3. k/30 +5 =k/10
5=k/10-k/30
5=3k/30-k/30
5=2k/30
5乘30=2k
150除2=k
k=150

sorry，我唔得閒……==