（1）2.73+0.85+0.15+3.27

=（2.73+3.27）+（0.85+0.15）

=6+1

=7

（2）3.25-（0.25+0.86）

=3.25-0.25-0.86

=3-0.86

=2.14

（3）0.25+3.68-0.25+2.32，

=（0.25-0.25）+（2.32+3.68）

=0+6

=6

（4）92.8-35.6-24.4，

=92.8-（35.6+24.4）

=92.8-60

=32.8

（5）102×0.45

=（100+2）×0.45

=100×0.45+2×0.45

=45+0.9

=45.9

（6）2.33×0.5×4

=2.33×（0.5×4）

=2.33×2

=4.66

（7）1.2×2.5+0.8×2.5

=（1.2+0.8）×2.5

=2×2.5

=5