F.1 方程 幾題 =]

Q1 :: 4/9 - Y/3 = 1/2
8-6y=9
-6y=1
y=-1/6

Q2 :: 1+2x/5 = -5
5+2x=-25
2x=-30
x=-15

Q3 :: 3z - 4/2 -3 = 1
6z-4-6=2
6z-10=2
6z=12
z=2

Q4 :: 6 = 9 + 1 - 5x /8
48-72-8=-5x
-32=-5x
x=5/32

Q5 :: 1 - ( 5 - 8x/9) = 8
9-45-72=-8x
-108=-8x
x=16

2006-11-03 20:19:20 補充：
Q4 :: 6 = 9 + 1 - 5x /8 48-72-8=-5x-32=-5xx=32/5

1) 4/9-Y/3=1/2

4/9-4/9-Y/3=1/2-4/9

Y/3=9/18-6/18

Y/3 =3/18

Y/3*3=3/18*3

Y=1/2


2) 1+2x/5=-5

1-1+2x/5=-5-1

2x/5=5

2x/5*5=5*5

2x=25

x=25/2


3) 3z-4/2-3=1

3z-2-3=1

3z-2-3+3=1+3

3z-2=4

3z-2+2=4+2

3z=6

z=2

4) 6=9+1-5x/8

6-9=1-5x/8

-3-1=-5x/8

-4x8=-5x

-32=5x

32/5=x

6,2/5=x

x=6,2/5


5)1-(5-8x/9)=8

1-5+8x/9=8

-4+8x/9=8

8x/9=8x4

8x/9=32

8x=32x9

8x=288

x=288/8

x=41