Maths. problem 3 (5 marks)
回答 (3)
2008-07-22 5:01 am
✔ 最佳答案
好簡單!!某3個數平均係13..
姐係13X3!!!
另外5個數平均係19!
姐係19X5!!
13X3+19X5 除 8 就OK啦!
答案係16.75!!!
參考: 自己
2008-07-22 6:29 am
let the original numbers be A, B and C respectively,
and D, E, F, G and H be the other 5 numbers,
becoz:
the sum of A, B and C = 13 x 3 = 39
the sum of D-H = 19 x 5= 95
therefore,
the mean for the 8 numbers is:
(39 + 95) / 8
= 16.75
i am 100 % sure it is correct!
and D, E, F, G and H be the other 5 numbers,
becoz:
the sum of A, B and C = 13 x 3 = 39
the sum of D-H = 19 x 5= 95
therefore,
the mean for the 8 numbers is:
(39 + 95) / 8
= 16.75
i am 100 % sure it is correct!
2008-07-22 5:06 am
這八個數的平均值=(13*3+19*5)/8
=(39+95)/8
=134/8
=16 3/4
=(39+95)/8
=134/8
=16 3/4
收錄日期: 2021-04-13 15:51:08
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