如题所述
第1个回答 2019-05-05
99X99X299
=100X99X299-1X99X299
=100X100X299-100X299-100X299+1X299
=2990000-(29900+29900)+299
=2990000-59800+299
=2990000-60000+200+299
=2930000+499
=2930499本回答被网友采纳
=100X99X299-1X99X299
=100X100X299-100X299-100X299+1X299
=2990000-(29900+29900)+299
=2990000-59800+299
=2990000-60000+200+299
=2930000+499
=2930499本回答被网友采纳