数学计算题,(1+3+5+ ``` +1999+2000+2001)-(2+4+6+```+1998+2002)99`````````9 Ⅹ 99`````````9+1999```````9(2000个9) (2000个9) (2000个9)
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数学计算题,(1+3+5+ ``` +1999+2000+2001)-(2+4+6+```+1998+2002)99`````````9 Ⅹ 99`````````9+1999```````9(2000个9) (2000个9) (2000个9)
数学计算题,
(1+3+5+ ``` +1999+2000+2001)-(2+4+6+```+1998+2002)
99`````````9 Ⅹ 99`````````9+1999```````9
(2000个9) (2000个9) (2000个9)
数学计算题,(1+3+5+ ``` +1999+2000+2001)-(2+4+6+```+1998+2002)99`````````9 Ⅹ 99`````````9+1999```````9(2000个9) (2000个9) (2000个9)
(1+3+5+ ``` +1999+2000+2001)-(2+4+6+```+1998+2002)
=(1-2)+(3-4)+(5-6)+```+(2001-2002)
=-1*2002/2
=-1001
99`````````9 Ⅹ 99`````````9+1999```````9
(2000个9) (2000个9) (2000个9)
=(10`````````0-1) Ⅹ 99`````````9+1999```````9
(2000个0) (2000个9) (2000个9)
=99`````````900`````````0-
(2000个9) (2000个0)
99`````````9+199`````````9
(2000个9) (2000个9)
=99`````````900`````````0+100`````````0
(2000个9) (2000个0) (2000个0)
=10000``````````````````00
(4000个0)
(1+3+5+ ``` +1999+2000+2001)-(2+4+6+```+1998+2002)=-1-1-1-1-......-1=-1001
99`````````9 Ⅹ 99`````````9+1999```````9
(2000个9) (2000个9) (2000个9)
=9999999..9*1000000000.......0=999999999....90000000000...0
第一题是不是有问题?