999...9(1998个9)*999...9(1998个9)+1999...9(1998个9)=?简便计算

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999...9(1998个9)*999...9(1998个9)+1999...9(1998个9)=?简便计算999...9(1998个9)*999...9(1998个9)+1999...9(1998个

999...9(1998个9)*999...9(1998个9)+1999...9(1998个9)=?简便计算
999...9(1998个9)*999...9(1998个9)+1999...9(1998个9)=?简便计算

999...9(1998个9)*999...9(1998个9)+1999...9(1998个9)=?简便计算
原式=999...9(1998个9)*999...9(1998个9)+1999...9(1998个9)
=999...9(1998个9)*(1000...0(1998个0)-1)+1000...0(1998个0)+999...9(1998个9)
=999...9000..0(1998个9接1998个0)-999...9(1998个9)+1000...0(1998个0)+999...9(1998个9)
=999...9000..0(1998个9接1998个0)+1000...0(1998个0)
=1000...0(1998x2个0)
=1000...0(3996个0)

999...9(1998个9)*999...9(1998个9)+1999...9(1998个9)
=999...9(1998个9)*999...9(1998个9)+100…0(1998个0)+999...9(1998个9)
=999...9(1998个9)*999...9(1998个9)+999...9(1998个9))+100…0(1998个0)
=999...9(199...

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999...9(1998个9)*999...9(1998个9)+1999...9(1998个9)
=999...9(1998个9)*999...9(1998个9)+100…0(1998个0)+999...9(1998个9)
=999...9(1998个9)*999...9(1998个9)+999...9(1998个9))+100…0(1998个0)
=999...9(1998个9)*(999...9(1998个9)+1)+100…0(1998个0)
=999...9(1998个9)*100…0(1998个0)+100…0(1998个0)
=(999...9(1998个9)+1)+)*100…0(1998个0)
=100…0(1998个0)*100…0(1998个0)
=100…0(3396个0)

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