六年级简算题654321*123456-654322*123455
问题描述：
六年级简算题654321*123456-654322*123455
答
因为
654321*123456
=(654322-1)*(123455+1)
=654322*123455+(654322-123455-1)
所以
654321*123456-654322*123455
=654322-123455-1
=530866
答
答：
原式
=654321*123456-(654321+1)*123455
=654321*(123456-123455)-123455
=654321-123455
=530866
答
654321×123456-654322×123455
=654321×（1+123455）-（654321+1）×123455
=654321×1+654321×123455-654321×123455-1×123455
=（654321×123455-654321×123455）+（654321×1-1×123455）
=0+530866
=530866