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求数学简算题(1) 3-4+5-6+7……2001-2002+2003-2004+2005 (2) 1/16+2/16+3/16+4/16……+14/16+15/16+14/16+13/16……+2/16+1/16
题目详情
求数学简算题
(1) 3-4+5-6+7……2001-2002+2003-2004+2005
(2) 1/16+2/16+3/16+4/16……+14/16+15/16+14/16+13/16……+2/16+1/16
(1) 3-4+5-6+7……2001-2002+2003-2004+2005
(2) 1/16+2/16+3/16+4/16……+14/16+15/16+14/16+13/16……+2/16+1/16
▼优质解答
答案和解析
3-4+5-6+7……2001-2002+2003-2004+2005
=(-1)+(-1)+(-1).+(-1)+2005
=(-1)*1001+2005
=-1001+2005
=1004
1/16+2/16+3/16+4/16……+14/16+15/16+14/16+13/16……+2/16+1/16
=(1/16+14/16)+(2/16+13/16).+(2/16+13/16)+(1/16+14/16)+15/16+7/16*2
=15/16*12+14/16
=194/16
=(-1)+(-1)+(-1).+(-1)+2005
=(-1)*1001+2005
=-1001+2005
=1004
1/16+2/16+3/16+4/16……+14/16+15/16+14/16+13/16……+2/16+1/16
=(1/16+14/16)+(2/16+13/16).+(2/16+13/16)+(1/16+14/16)+15/16+7/16*2
=15/16*12+14/16
=194/16
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