6.25－（2.97＋1.75）这道题怎么简算？

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）

=6.25-2.97-1.75

=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

=6.25-2.97-1.75
=6.25-1.75-2.97
=4.5-2.97
=4.5-(3-0.03)
=1.5+0.03
=1.53

6.25－（2.97＋1.75）=6.25－（3-0.03＋1.75）=6.25－（3＋1.72）=6.25－4.72=1.53

先把 2.97加上0.03计算出结果，等于1.5，再减0.03等于1.47

9.9*5.5+0.55=9.9*5.5+5.5*0.1=5.5*(9.9+0.1)=55