999*998998999-998*999999998=?注明解题思路
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999*998998999-998*999999998=?注明解题思路999*998998999-998*999999998=?注明解题思路999*998998999-998*999999998=?注
999*998998999-998*999999998=?注明解题思路
999*998998999-998*999999998=?注明解题思路
999*998998999-998*999999998=?注明解题思路
=999 x (998998998+1) - 998 x (999999999 -1)
=（999 x 998 x 1001001 +999）-（998 x 999 x1001001 -998)
=998 + 999
=1997
999 x 998998999 - 998 x 999999998全过程.
请写出解题过程：999×998998999-998×999999998
999*998998999-998*999999998=?注明解题思路
999乘998998999减998乘999999998的简便计算等于1997
99又999分之998乘999;1000又999分之998乘999
99又999分之998乘999;1000又999分之998乘999
1000+999分之998*999=?99+999分之998*999=?给算式
99又999分之998*9+1
999 x 998998999 - 998 x 999999998x=乘号要全过程啊····要简算
1000又999分之998*999?（用简便方法计算) 1)1000又999分之998*999?2)99又999分之998 *999 （用简便方法
99+100+101+102+...+998+999等于几,
999*999+1000*998
999×999＋998×998＝?hadfi
-999 * -998 * -997*.*997*998*999=?
999*999-1002*998=( )
999^2-1002*998
999²-1002*998
999²-1002*998