數學題,10分....快

1. 5/4t + 3 = 3/4t
(5/4t + 3) X 4 = 3/4t X 4
5t + 12 = 3t
2t = -12
t = -6

2. (2y + 1) / 5 = 3 - y (你寫的是: 2y + 1 起上, 5 起下 吧??)
[(2y + 1) / 5] X 5 = 5 X (3 - y)
2y + 1 = 15 - 5y
7y = 14
y = 2

3. b/3 - (5 - b) = 3
b/3 - 5 + b = 3
(b/3 - 5 + b) X 3 = 3 X 3
b - 15 +3b = 9
4b = 24
b = 6

4. x/3 - x/2 = 1
(x/3 - x/2) X 6 = 1 X 6
2x - 3x = 6
-x = 6
x = -6

1. 5/4t+3=3/4t
5/4t-3/4t=-3
2/4t=-3
2=12t
t=1/6
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2.2y+1/5=3-y
2y+1=5(3-y)
2y+1=15-5y
7y=14
y=2
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3.b/3- (5-b)=3
2b-5=9
b=2
-----------------------------------------
4.x/3-x/2=1
2 x+3x/6=1
5x=6
x=6/5
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1. 5/4t+3=3/4t
4t(5/4t+3)=4t(3/4t)
5+12t=3
12t=-2
t=-1/6

2. 2y+1/5=3-y
5(2y+1/5)=5(3-y)
10y+1=15-5y
15y=14
y=14/15

3. b/3- (5-b)=3
3[b/3-(5-b)]=3(3)
b-15+3b=9
4b=24
b=6

4. x/3-x/2=1
6(x/3-x/2)=6(1)
2x-3x=6
-x=6
x=-6

1. 5/4t+3=3/4t (全式乘4)
5t + 12 = 3t
2t = -12
t = -6

2. (2y+1)/5 = 3-y (全式乘5)
2y+1=15-5y
7y = 14
y = 2

3. b/3 - (5-b) = 3 (全式乘3)
b/3 - 5+b = 3
b/3 +b = 8
b + 3b = 24
4b = 24
b = 6

4. x/3 - x/2 = 1 (全式乘6)
2x - 3x = 1
-x = 1
x = -1