趕快答..方程問題~

1. y+y-1 = 19
2y = 20
y = 10

2. 4y-6 = 2y+5
2y = 11
y = 5.5

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

4. 你的問題好像有點問題

5. 2[ 6+(4x-5) ] = 30
6+(4x-5) = 15
6+4x-5 = 15
4x =14
x = 3.5

1.
y+y-1=19
2y-1=19
2y=20
y=10

2.
4y-6=2y+5
4y=2y+11
2y=11
y=5.5

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

4.
解唔到依題方程

5.
2[6+(4x-5)]=30
12+8x-10=30
12+8x=40
8x=28
x=3.5

1. y+y-1 = 19
2y-1+1=19+1
2y=20
2y/2=20/2
y=10

2. 4y-6 = 2y+5
4y-2y=5+6
2y=11
y=5.5

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

4. 6x5+2y
你依題都唔係方程...
所以解唔到...

5. 2[ 6+(4x-5) ] = 30
6+(4x-5)=15
4x-5=9
4x=14
x=3.5