Jawabanmu

2014-09-03T20:02:18+07:00
A.(-3m+4n-6)-(7n-8m+10)=-3m-(-8m)+4n-7n-6+10=
-3m+8m-3+4=5m-3n+4
b.(15a+7b-5c)-(-11a-12b+13d)=15a-(-11a)+7b-(-12b)-5c-13d
15a+11a+7b+12b-5c-13d=26a+19b-5c-13d