kakak pliss jawab pertanyaan aku ya...dan jawab semuanya dari a.-f.

a)=B+C
=(2a-3b+c)+(5a+2b-4c)
=7a-a-3c
b)=A+B-C
=(a+3b)+(2a-3b+c)-(5a+2b-4c)
=-3a+2b-3c
c)=B-C
=(2a-3b+c)-(5a+2b-4c)
=-3a-b+5c
d)=2[(-B+2C)-A]
=2[(-(2a-3b+c)+2(5a+2b-4c))-(a+3b)]
=2[(-2a+3b-c)+(10a+4b-8c)-(a+3b)]
=2[7a+10b-6c]
=14a+20b-12c
e)=3(A-B+C)
=3((a+3b)-(2a-3b+c)+(5a+2b-4c))
=3(4a+6b-5c)
=12a+18b-15c
f)=3(2A-B) +2C
=3((2(a+3b))-(2a-3b+c))+2(5a+2b-4c)
=3((2a+6b)-(2a-3b+c))+(10a+4b-8c)
=3(9b+c)+(10a+4b-8c)
=(27b+3c)+(10a+4b-8c)
=10a+31b-5c