6.25-(2.97+1.75)
=6.25-2.97-1.75
=6.25-(3-0.03)-(2-0.25)
=6.25-3+0.03-2+0.25
=6.5-5+0.03
=1.5+0.03
=1.53
9.9*5.5+0.55
=5.5*(9.9+0.1)
=5.5*10
=55
6.25-(3+1.50+0.25-.0.03)
6.25-(4.0+.0.50+0.25-0.03)
6.25-4.0-.050-0.25
6.25-(2.97+1.75)=(6.25-1.75)-2.97=4.5-2.97=1.53
6.25-(2.97+1.75)=6.25-(3-0.03+1.75)=6.25-(3+1.72)=6.25-4.72=1.53
=6.25-2.97-1.75
=6.25-1.75-2.97
=4.5-2.97
=4.5-(3-0.03)
=1.5+0.03
=1.53