中一數學題(急)

2008-11-21 2:51 am

solve the following equations,列式,thx~

1. x除5減2x除15 = 3

2.6[2(2-y)-3y] = 24

回答 (4)

2008-11-21 9:25 pm

✔ 最佳答案

1. x除5減2x除15 = 3
x/5-2x/15=3
3x-2x=45......................一齊乘15
x=45

2.6[2(2-y)-3y] = 24
2(2-y)-3y =4
4-2y-3y = 4
4-5y = 4
5y=0
y=0

參考: 會考數學拿c既人~

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2008-11-21 3:20 am

1.
x除5減2x除15 = 3
x/5 - 2x/15 =3
3x/15-2x/15=3
x/15=3
x=45

2.
6[2(2-y)-3y] = 24
6[4-2y-3y] = 24
24-12y-18y = 24
24-30y=24
-30y=0
y=30

參考: 自己 Of myself

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2008-11-21 3:02 am

１　Ｘ／５－２ｘ／１５＝３
　　３ｘ－２ｘ＝４５
　　ｘ＝４５
２　６（４－２ｙ－３ｙ）＝２４
　　６（４－５y)=24
24-5y=24
-5y=0
y=0

參考: myself

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2008-11-21 2:59 am

1.
x除5減2x除15 = 3
x/5 - 2x/15 =3
3x/15-2x/15=3
x/15=3
x=45

2.
6[2(2-y)-3y] = 24
6[4-2y-3y] = 24
24-12y-18y = 24
24-30y=24
-30y=0
y=30

參考: 自己

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