99999的平方加199999 是多少,简便方法
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99999的平方加199999 是多少,简便方法
![99999的平方加199999 是多少,简便方法](/uploads/image/z/16595532-36-2.jpg?t=99999%E7%9A%84%E5%B9%B3%E6%96%B9%E5%8A%A0199999+%E6%98%AF%E5%A4%9A%E5%B0%91%2C%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95)
99999^2+199999
=(1000000-1)^2+199999
=1000000000000-2000000+1+199999
=1000000000000-2000000+2000000
=1000000000000
再问: 不对啊
再答: ??????? 对啊
再问: 哪来的1000000
再答: 99999 =100000-1 99999^2+199999 =(100000-1)^2+199999 =10000000000-200000+1+199999 =10000000000-200000+200000 =10000000000
=(1000000-1)^2+199999
=1000000000000-2000000+1+199999
=1000000000000-2000000+2000000
=1000000000000
再问: 不对啊
再答: ??????? 对啊
再问: 哪来的1000000
再答: 99999 =100000-1 99999^2+199999 =(100000-1)^2+199999 =10000000000-200000+1+199999 =10000000000-200000+200000 =10000000000