问题
解答题
认真观察例题,找出规律,试着解答后面的题. 例:
=
=
=
该你出招了:
|
答案
-1999+19991999+199919991999 1997+19971997+19971997997 2 1997
=
-1999×(1+10001+100010001) 1997×(1+10001+100010001)
,2 1997
=
-1999 1997
,2 1997
=1.
认真观察例题,找出规律,试着解答后面的题. 例:
=
=
=
该你出招了:
|
-1999+19991999+199919991999 1997+19971997+19971997997 2 1997
=
-1999×(1+10001+100010001) 1997×(1+10001+100010001)
,2 1997
=
-1999 1997
,2 1997
=1.