1999+999*999
=1000+999+999*999
=1000+999(1+999)
=1000(1+999)
=1000000
360*26+260*64
=36*260+260*64
=260(36+64)
=260*100
=26000
1999+999*999
=1000+999+999*999
=1000+999(1+999)
=1000(1+999)
=1000000
360*26+260*64
=36*260+260*64
=260(36+64)
=260*100
=26000