0.125×25×1.6
=0.125×25×8×0.2
=(0.125×8)×(25×0.2)
=1×5
=5
99×2.8
=(100-1)×2.8
=100×2.8-1×2.8
=280-2.8
=278.2
70÷1.25
=70÷(10÷8)
=70÷10×8
=7×8
=56