125×25×33
=125×25×(32+1)
=125×25×32+125×25
=(125×8)×(25×4)+125×(24+1)
=1000×100+125×24+125
=100000+125×8×3+125
=100000+1000×3+125
=100000+3000+125
=103125
125×25×33
=125×25×(32+1)
=125×25×32+125×25
=(125×8)×(25×4)+125×(24+1)
=1000×100+125×24+125
=100000+125×8×3+125
=100000+1000×3+125
=100000+3000+125
=103125