(3/16-0,45)×0,8-0,21:0,2=
(0.1875-0.45)*0.8-0.21/0.2=-0.21+1.05=1.26
(3/16-0,45)*0,8-0,21/0,2=
(3/16-9/20)*4/5-(21/100)/(1/5)=
((15-36)/80)*4/5-(21*5/100)=
(-21*4)/(80*5)-105/100=
-21/100-105/100=
(-21-105)/100=
-126/100=
-1,26