简便运算:9999²+19999

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简便运算:9999²+19999

简便运算:9999²+19999
简便运算:9999²+19999

简便运算:9999²+19999
9999²+19999
=9999²+2×9999 +1
=(9999+1)²
=10000²
=100000000

9999²+19999
=(10000-1)²+19999
=100000000-20000+1+19999
=99980000+(1+19999)
=99980000+20000
=100000000