（1）8.56×2.7+1.44×2.7

=（8.56+1.44）×2.7

=10×2.7

=27；

（2）1.25×2.5×4×0.8

=（1.25×8）×（2.5×4）

=10×10

=100；

（3）5.74×99+5.74

=5.74×（99+1）

=5.74×100

=574；

（4）72×0.03+0.3×2.8

=7.2×0.3+0.3×2.8

=（7.2+2.8）×0.3

=10×0.3

=30．