Решение (3/16-0.45)*0.8-0.21:0.2
3/16-45/100=3/16-9/20=15/80-36/80=-21/80 -21/80*0,8=-21/80*4/5=-21/100=-0,21 0,21:0,2=1,05 -0,21-1,05=-1,26