999²+1999怎么算?
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![999²+1999怎么算?](/uploads/image/z/695726-62-6.jpg?t=999%26%23178%3B%2B1999%E6%80%8E%E4%B9%88%E7%AE%97%3F)
999²+1999怎么算?
999²+1999怎么算?
999²+1999怎么算?
999²+1999
=999²+999+1000
=999*(999+1)+1000
=999*1000+1000
=1000*(999+1)
=1000*1000
=1000000
999²+1999
=999²+1998+1
=999²+2*999+1
=(999+1)²
=1000²
=1000000