機動同盟 Gundam HK

#1 equation(唔該幫幫手)
1) If the length of each side of a square is increase by 3 cm ,then the perimter becomes 4 times the
original perimter .Find
(a) the original perimter of the square ,
(b) the new area of the square
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2) There are some marbles in a blue bag and a red bag ,and the number of the marbles in the blue bag is 2 times that of the red ba ..

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