559*8.41+55.9*15.9=559*8.41+559*1.59=559*（8.41+1.59）=559*10=5590
=55.9x10x8.41+55.9x15.9=55.9x(84.1+15.9)=55.9x100=5590
55.9*8.41*10+55.9*1.59*10
