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2009-05-13 5:50 am

y:5=(y+4):7
這條我不懂？？？？

回答 (4)

2009-05-13 6:05 am

✔ 最佳答案

To make it simple, you can always change the ":" into a "/"
y:5=(Y+4):7
=> y/5=(y+4)/7
=> 7y=5(y+4)
=> 7y=5y+20
=> 7y-5y=20
=> 2y=20
=> y=10

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2009-05-13 5:59 am

用交叉相乘:

y:5 = (y+4):7

7y = 5(y+4) (兩個互相乘)

7y = 5y + 20

7y-5y = 5y +20 -5y

2y = 20

2y/2 = 20/2

y = 10

參考: Maths

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2009-05-13 5:58 am

y/5 = y+4 / 7

7y = 5y +20

2y = 20

y = 10

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2009-05-13 5:58 am

y:5=(y+4):7

7y=5y+20

2y=20

y=10

help i can help you

參考: myself

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