Jawabanmu

2014-08-26T19:41:31+07:00
7m+5n-2k+5k-2n-9m= 7m-9m+5n-2n-2k+5k
                                 -2m+3n+3k
1 5 1
2014-08-26T19:42:55+07:00
7m+5n-2k+5k-2n-9m
=7m-9m+5n-2n-2k+5k
=-2m+3n+3k
1 5 1