1.2.3.题,

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1.2.3.题,
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1.2.3.题,
1.2.3.题,
 

1.2.3.题,
9999×8889+3333×3333+9
=9999×8889+1111×3×1111×3+9
=9999×8889+9999×1111+9
=9999×(8889+1111)+9
=9999×10000+9
=99990000+9
=99990009
2/2x4+2/4x6+2/6x8+2/8x10+2/10x12
=(1/2-1/4)+(14-1/6)+(1/6-1/8)+(1/8-1/10)+(1/10-1/12)
=1/2-1/12
=5/12
2001x(1/8-1/2009)+8x(1/2001-1/2009)-2009x(1/8+1/2009)+8
=2001/8-2001/2009+8/2001-8/2009-2009/8-2009/2009+8
=(2001/8-2009/8)-(2001/2009+8/2009)+8/2001-1+8
=-1-1+8/2001-1+8=5又8/2001
请采纳~谢 不采纳我画圈圈

好评。我算给你