8.8×4.2×0.0125＝（1.1×4.2）×（8×0.0125）＝4.62×0.1＝0.462
8.8×4.2×0.0125
=8×1.1×4.2×0.0125
=8×0.0125×1.1×4.2
=0.1×1.1×4.2
=0.462
