1999乘19981998减1998乘19991999=?

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1999乘19981998减1998乘19991999=?1999乘19981998减1998乘19991999=?1999乘19981998减1998乘19991999=?1999*19981998

1999乘19981998减1998乘19991999=?
1999乘19981998减1998乘19991999=?

1999乘19981998减1998乘19991999=?
1999*19981998-1998*19991999
=1999*1998(10001-10001)
=0

0
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0
tyfrttyfdtufgftfgfgfgfgfgfgfgfgfgfgfgfgfgfgfgfggfgfgfgfgfggfggfgfgfgfgfgfgfgfgfgfgfgfgfgfgfgfgfgfgfgfgfgfgfgfgfgffgfgfgfgfgfgfgfgfgfgfgfgfgfgfgfgfgfgfgfgfgfgfgfgfgfgffggfgffggfffgfgfgffgfgfgfgfgfgfgfgfgfgfgfgfgfgfgfgfgfgffgfgfgfgfgfgfgfgfgfggfgfgfgfgfggffgfgfgfgfffgfgfgfffffffgfgfffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff

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2000乘1999-1999乘1998+1998乘1997-1997乘1996+.2乘1 1998乘19991999减1999乘19981998简便计算 1999乘19981998减1998乘19991999=? 求2000乘1999—1999乘1998+1998乘1997—1997乘1996+.+2乘1简便算法 1乘2乘3乘4乘5乘6乘7乘8乘9乘10减x=10000求大神帮助求x 数学计算2002乘2001—2001乘2000+2000乘1999—1999乘1998+1998乘1997—1996+A+4乘3—3乘2+2乘1= 用简便方法计算:1999乘1998减1998乘1997减1997乘1996加1996乘1995 1999乘1998减1998乘1997加1997乘1996减1996乘1995.用简便方法计算. 1998乘19991999减1999乘19981998等于几?（写出过程） 1999乘19981998减1998乘19991999=?要简便又详细的方法 1/1998乘1999+1/1999乘2000+.1/2005乘2006+1/2006急用! 求√（1999乘2000乘2001乘2002加1）减2002的平方 5乘6乘7乘8乘9分之5乘6乘7乘8乘9减1乘2乘3乘4乘5（用简便方法算） 1999乘1999-1998乘2000 1995乘1996乘1997乘1998乘1999乘2000一直乘到2011等于多少? 1乘2乘3乘4乘5乘.乘1999的结果中 末尾连续有几个0? 1999乘20002000减2000乘19991999 求2000乘1999减去1999乘1998加1998乘1997减去1997乘1996加...加2乘1的简便算法