3(2a-b)+3(a-b)2-6(2a-b)+3(b-2a)
=6a-3b+3a2-3b2-12a+6b+3b-6a
=(6a-12a-6a)-(3b+6b+3b)+3a2-3b2
=(-18a)-12b+3a2-3b2
a=1/4 b=1/3
(-18a)-12b+3a2-3b2
=(-4.5)-4+(3/16)-3
=(-8.5)+(3/16)-3
=(17/2)+(3/16)-3
=(139/16)-3
=5.6875
3(2a-b)+3(a-b)2-6(2a-b)+3(b-2a)
=6a-3b+3a2-3b2-12a+6b+3b-6a
=(6a-12a-6a)-(3b+6b+3b)+3a2-3b2
=(-18a)-12b+3a2-3b2
a=1/4 b=1/3
(-18a)-12b+3a2-3b2
=(-4.5)-4+(3/16)-3
=(-8.5)+(3/16)-3
=(17/2)+(3/16)-3
=(139/16)-3
=5.6875