幫幫手-[*解方程

2x+3=11
2x = 11 - 3
2x = 8
x = 8 / 2
x = 4


5x-6=9
5x = 9 + 6
5x = 15
x = 15 / 5
x = 5


2y+5/2=7又2/1
2y + 5/2 = 15/2
2y = 15/2 - 5/2
2y = 10/2
2y = 5
y = 5 / 2
y = 2又2分之1(即2又1/2)


y+1/5 - 2 =1
y = 1 - 1/5 + 2
y= 2又5分之4 (即 2又4/5)


4y-12/6+9=17
4y - 2 + 9 = 17
4y + 7 = 17
4y = 17 - 7
4y = 10
y = 10 / 4
y = 2又2分之1 (即2又1/2)

12y-25/13-4=9
12y = 9 + 25/13 + 4
12y = 194 / 13
12y x 13 = 194
156y = 194
y = 194 / 156
y = 97 / 78
y = 1又78分之19 (即1又19/78)

2007-07-31 15:14:47 補充：
坦白講，我唔肯定你條題目會唔會其實係咁：y 1/5 - 2 =1..........應該係(y 1)/5 - 2 = 14y-12/6 9=17........應該係(4y-12)/6 9=1712y-25/13-4=9.......應該係(12y-25)/13-4=9所以我做埋呢d可能啦...^^(y 1)/5 - 2 = 1(y 1)/5 = 1 2(y 1)/5 = 3y 1 = 3 x 5y 1 = 15y = 15 - 1y = 14

2007-07-31 15:15:01 補充：
(4y-12)/6 9=17(4y-12)/6 = 17 - 9(4y-12)/6 = 84y - 12 = 8 x 64y - 12 = 484y = 48 124y = 60y = 60 / 4y = 15(12y-25)/13-4=9(12y-25)/13 = 9 4(12y-25)/13 = 1312y - 25 = 13 x 1312y - 25 = 16912y = 169 2512y = 194y = 194 / 12y = 97 / 6y = 16又6分之1 (即16又1/6)

2007-07-31 15:17:11 補充：
下面位朋友仔，提醒了我...我第二題係：5x-6=95x = 9 65x = 15x = 15 / 5x = 3.......(sorry，一時打錯...^^)

2x+3=11
2x=11-3
2x=8
x=4


5x-6=9
5x=9+6
5x=15
x=3


2y+5/2=7 1/2
2y=15/2-5/2
2y=10/2
2y=5
y=5/2


y+1/5-2=1
y=1-1/5+2
y=5/5-1/5+10/5
y=14/5


4y-12/6+9=17
4y=17+12/6-9
4y=17+2-9
4y=10
y=5/2


12y-25/13-4=9
12y=9+25/13+4
12y=25/13+169/13
12y=194/13
y=97/78

2x+3=11
2x=11-3
2x=8
x=4

5x-6=9
5x=9+6
5x=15
x=3

2y+5/2=7又2/1
2y+5/2=15/2
2y=15/2 - 5/2
2y=5
y=2.5

y+1/5 - 2 =1
y+1/5=1+2
y+1/5=3
y=3 - 1/5
y=2又5/5 - 1/5
y=2又5/4

4y-12/6+9=17
4y-2+9=17
4y-2=17-9
4y-2=8
4y=8+2
4y=10
y=2.5


最尾個題唔識計

2007-07-31 15:07:56 補充：
應該係y+1/5 - 2 =1y+1/5=1+2y+1/5=3y=3 - 1/5y=2又5/5 - 1/5y=2又4/5上面個位既第2題. . 15/5 點會係5呀