解：原式=999*222+333*（111+1）+666*111=999*222+（333*111+666*111）+333=999*222+111*（333+666）+333=999*222+999*111+333=999*（222+111）+333=999*333+333=（999+1）*333=1000*333=333000
=333✘(666+112+222)=333000
如图，望采纳，多谢~
