125*25*25
=125 (25*25)
=125(2*3*100+25)
=125*625
=(100+25)(+600+25)
=625+60000+2500+15000
=78125你什么意思？25*25 =（2*3）*100+25=62535*35=（3*4）*100+25=122545*45=（4*5）*100+25=2025这是简便计算