Question

72×59+128-59简便计算？

Answer 1

=59×（72-1）+128
=59×71+128
=59×71+118+10
=59×（71+2）+10
=59×73+10
=（60-1）（70+3）+10
=4200-3-70+180+10
=4200+117
=4317

Answer 2

72×59+128-59
＝72×59+（128-59）
＝72×59+69
＝72×（59+1）+10
＝72×60+10
＝4320+10
＝4330