--超趕 , 40 marks -- 各位知識朋友 , 入黎幫我手 ar !!! ( 數學F.1 ) (59)

1)

1-Y÷2 = 3Y÷4
1×4－(Y÷2)×4 = (3Y÷4)×4
4－2Y = 3Y
4－2Y＋2Y = 3Y＋2Y
5Y = 4
Y = 4/5

2)

6X－(1÷4) = X－(1÷3)
6X×12－(1÷4)×12 = X×12－(1÷3)×12
72X－3 = 12X－4
60X = -1
X = -1/60

3)

4(3X÷2－6＋X) = 3(X－1)
4(3X/2＋2X/2－6) = 3(X－1)
4(5X/2－6) = 3(X－1)
10X－24 = 3X－3
7X = 21
X = 3

2008-05-24 19:18:44 補充：
希望你明啦!!!!!!

2008-05-24 19:24:52 補充：
selinawen61唔小心計錯咗第二條數..........

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

2.
6x-1/4=x-1/3
6x-x=-1/3+1/4
5x=1/12
x=1/60

3.
4(3x/2-6+x)=3(x-1)
6x-24+4x=3x-3
10x-24=3x-3
10x-3x=-3+24
7x=21
x=3


hope this can help you!

1.

1 - y/2 = 3y/4

4 - 2y = 3y <-- All *3

4 = y <-- All +2y

y = 4 <-- reverse

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ATTENTION OTHER ANSWERERS : NO COPYING!!!

2.

6x - 1 / 4 = x - 1/3

5x = - 1/3 + 1/4 <-- All -x

5x = (- 4 + 3) /12

x = - 1/12 <-- All /5



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3.

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

6x - 24 + 4x = 3x - 3 <-- remove ( )s

10x - 3x = - 3 + 24 <-- All +24 and -3x

7x = 21

x = 3 <-- All / 7


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ATTENTION OTHER ANSWERERS : NO COPYING!!!

2008-05-24 18:45:47 補充：
MISTAKE: ignore the & l t ; thing