六年级简便运算:222×999+666×667 999×999+1999

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六年级简便运算:222×999+666×667 999×999+1999
六年级简便运算:222×999+666×667 999×999+1999

六年级简便运算:222×999+666×667 999×999+1999
222×999+666×667
=222*3*333+666*667
=666*333+666*667
=666*(333+667)
=666*1000
=666000
999×999+1999
=999^2+1998+1
=999^2+2*999*1+1^2
=(999+1)^2
=1000^2
=1000000

222×999+666×667
=222*3*333+666*667
=666*333+666*667
=666*(333+667)
=666*1000
=666000
999×999+1999
=999*999+999+1000
=999*(999+1)+1000
=999000+1000
=1000000

222×999+666×667
=222*3*333+666*667
=666*333+666*667
=666*(333+667)
=666*1000
=666000
999×999+1999
=999*999+999+1000
=999*(999+1)+1000
=999000+1000
=1000000
肯定对