（1）0.125×0.25×0.5×0.64，
=0.125×0.25×0.5×0.2×0.4×8，
=（0.125×8）×（0.25×0.4）×（0.5×0.2），
=1×0.1×0.1，
=0.01；
（2）172.4×6.2+272.4×3.8，
=172.4×6.2+（100+172.4）×3.8，
=172.4×6.2+172.4×3.8+100×3.8，
=172.4×（6.2+3.8）+380，
=172.4×10+380，
=1724+380，
=2104．