666X667+222X99
=666(*667+33)
=666*700
=(600+60+6)*7*100
=(4200+420+42)*100
=4662*100
=466200
666X667+222X99
= 666 X 667 + 222 X 3 X 33
= 666 X 667 + 666 X 33
= 666 X (667+33)
= 666 X 700
= 466200
望采纳
亲,最后到底是 X 99呢,还是 X 999呢?看清楚哦
很简单啊
666X667+222X3X33
=666X667+666X33
=666X(667+33)
=666X700
=466200
666×667+222×999
= 666×667+222×3×333
=666×667+666×333
=666×(667+333)
=666×1000
=666000
=111×6×667+111×2×99
=111×(6×667+2×99)
=111×(4002+198)
=111×(4000+200)
=111×4000+111×200
=444000+22200
=466200