Jawabanmu

2014-09-12T05:46:54+07:00
(-3m+4n-5) + (7n-8m+10)
= -3m-8m+4n+7n-5+10
= -11m+11n-5
kalo ga salah ini jawabannya

(-3m+4n-5)+(7n-8n+10).
=-3m-8m+4n+7n-5+10.
=-11m+11n+5.
=11(-m+n) +5
2014-09-12T05:50:17+07:00
-3m-8m+4n+7n-5+10
-11m+11n+5

Dikelompokkan dulu supaya bisa mengerjakannya