41.
1) a6b75 :ab25=a6b7ab25=
=a5b55=ab
2) 81x4y3 :3xy3=81x4y3xy3=
=27x33=33x33=3x
3) 3xy23 :y9x23=3xy2 :y9x23=
=3xy2∙9x2y3=27x3y33=
=33x3y33=3xy
4) 2ba34 :a8b34=2ba3 :a8b34=
=2ba3∙8b3a4=16b4a44=
=24b4a44=2ba