1-2+3-4+5-6+```+87-88=?Please reply to me quickly``````````````````````````````
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1-2+3-4+5-6+```+87-88=?Please reply to me quickly``````````````````````````````
1-2+3-4+5-6+```+87-88=?
Please reply to me quickly``````````````````````````````
1-2+3-4+5-6+```+87-88=?Please reply to me quickly``````````````````````````````
1+2+3-4+5+6+7-8+.+85+86+87-88
=1+2+3+4+5+6+7+8+...+85+86+87+88-4*2-8*2-12*2-...-88*2
=(1+88)*88/2-8*1-8*2-8*3-...-8*22
=44*89-8*(1+2+3+...+22)
=44*89-8*(1+22)*22/2
=44*89-8*11*23
=44*89-44*46
=44*(89-46)
=44*43
=1892.
两个一对
1-2=-1
3-4=-1
.
.
.
87-88=-1
一共44对，所以结果=-44
先把每两个分成一组，不难发现每组结果都相同，再乘以组数即可．
1-2+3-4+5-6+…+87-88
=（1-2）+（3-4）+（5-6）+…+（87-88）
=-1×
88
2
=-1×44
=-44．
故应填-44．
1-2+3-4+5-6+……+87-88
=(1-2)+(3-4)+(5-6)+……+(87-88)
=(-1)+(-1)+(-1)+……+(-1)
共有88/2，即44个-1
所以答案是-44
-44
1-2+3-4+5-6+……+87-88
=(1-2)+(3-4)+(5-6)+……+(87-88)
=(-1)+(-1)+(-1)+……+(-1)
共有88/2，即44个-1
所以答案是-44
-44.
007vsSB看错题了吧？！
-44
1-2+3-4+5-6+...+87-88
=(1-2)+(3-4)+.....+(87-88)
=-1*(88/2)
=-1*44
=-44
这题关键是看你怎么分配这些数！
恩 是-44
1-2+3-4+5-6+```+87-88
=(1-2)+(3-4)+(5-6)+```+(87-88)
=(-1)+(-1)+(-1)+```+(-1)
=(-1)*88/2
=-44
1-2+3-4+5-6+……+87-88
=(1-2)+(3-4)+(5-6)+……+(87-88)
=(-1)+(-1)+(-1)+……+(-1)
共有88/2，即44个-1
所以是-44
就是44个-1相加 答案是-44!