數學題urgent
回答 (2)
2007-12-31 8:29 am
✔ 最佳答案
設m, n為兩個整數x/a=m 移項後寫成 x=am____(1)
(y-x)/a=n 移項後寫成 y=an+x____(2)
將式(1)代入式(2)的x中, y=an+am=a(m+n)
所以, y/a=a(m+n)/a=m+n
因為m和n都是整數, 所以m+n亦是整數
=>y可以被a整除
2007-12-31 8:30 am
x=k1a..........(1)
y-x=k2a.......(2)
where k1 and k2 are constants.
from (2),
y=k2a+x
=k2a+k1a
=(k1+k2)a
since k1 and k2 are contants, so y is divisible by a.
y-x=k2a.......(2)
where k1 and k2 are constants.
from (2),
y=k2a+x
=k2a+k1a
=(k1+k2)a
since k1 and k2 are contants, so y is divisible by a.
參考: me...
收錄日期: 2021-04-16 23:10:45
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