21/4*19/10-21/4*49/10=.

Question

21/4*19/10-21/4*49/10=.

Answer 1

21/4=5.25
5.25*19=99.75
99.75/10=9.975
21/4=5.25
5.25*49=257.25
257.25/10=25.725
9.975-25.725=-15.75