用简便方法计算 1999²+3998+1 11²+13*66+39²
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用简便方法计算 1999²+3998+1 11²+13*66+39²
用简便方法计算 1999²+3998+1 11²+13*66+39²
用简便方法计算 1999²+3998+1 11²+13*66+39²
1999²+3998+1
=1999²+2*1999*1+1
=(1999+1)²
=2000²
=4000000
11²+13*66+39²
=11²+2*11*39+39²
=(11+39)²
=50²
=2500