（1）8.8×12.5×0.7

=1.1×8×12.5×0.7

=（1.1×0.7）×（8×12.5）

=0.77×100

=77；

（2）0.64×0.25×1.25×50

=0.8×0.8×0.25×1.25×50

=（0.8×1.25）×（0.8×0.25×50）

=1×10

=10；

（3）6.42×13.51+13.51×3.58

=（6.42+3.58）×13.51

=10×13.51

=135.1；

（4）6.75×87.12-77.12×6.75

=（87.12-77.12）×6.75

=10×6.75

=67.5；

（5）16-3.12×1.5

=16-4.68

=11.32；

（6）12.8+7.2×0.3

=12.8+2.16

=14.96；

（7）8.15×（12.75-8.95）

=8.15×3.8

=30.97；

（8）5.62×3.1-2.1×1.38

=17.422-2.898

=14.524；

（9）5.23×0.76+52.3×0.024

=5.23×0.76+5.23×0.24

=5.23×（0.76+0.24）

=5.23×1

=5.23；

（10）96.51×3.1+3.1×4.59-3.1

=（96.51+4.59-1）×3.1

=100.1×3.1

=（100+0.1）×3.1

=100×3.1+0.1×3.1

=310+0.31

=310.31．