(7/12 - 8/15) в квадрате + 4/5 * ( 7/10-9/16)

Question

(7/12 - 8/15) в квадрате + 4/5 * ( 7/10-9/16)

Answer 1

=49/144-28/45+64/225+14/25-9/20=49/144+10/45-9/20=81/144-9/20=9/16-9/20=45/80-36/80=9/80