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標題: form 2 math questions help!!!!!!!! [打印本頁]

作者: victorique 時間: 23-10-2011 14:35 標題: form 2 math questions help!!!!!!!!

(a) Given that (x-1): (x+1) = 2:3 and x:y = 5:4 , find the values of x and y.

(b) if 1/y : 1/z = 3:5 , express z in term of y and hence find the value of z.

(c) find x/y+z : y/x+z : z/x+y

作者: 13少 時間: 23-10-2011 15:44

(a)  ( x - 1 ) / ( x + 1 ) = 2 / 3
                     3x - 3 = 2x + 2
                           x = 5
   put x = 5 into x:y = 5:4
   then  (5) : y = 5 : 4
                     y = 4

(b)  1/y : 1/z = 3:5
   (1/y) / (1/z) = 3/5
               z/y=3/5
                  z= 3y/5

作者: 13少 時間: 23-10-2011 16:25

(c) 試下自己計，我唔想你全部係度抄功課

作者: victorique 時間: 29-10-2011 13:29

This is no a homework , I test maths ~~~

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