Сократите дроби : 2)51ху/17х 3)21×56+21×4/21×56-21×5 4)3х-15у/4х-20у

Question

Сократите дроби : 2)51ху/17х 3)21×56+21×4/21×56-21×5 4)3х-15у/4х-20у

Answer 1

=3у
=((21*(56+4))/((21*(56-5))=60/51=20/17=1 3/17
=(3*(х-5у))/(4*(х-5у))=3/4