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)=?简便计算
999...9(1998个9)*999...9(1998个9)+1999...9(1998个9)=?简便计算
数学人气:361 ℃时间:2019-11-18 07:24:08
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