1-2+3-4+5-6…+87-88=

2024-12-21 06:35:28
推荐回答(3个)
回答1:

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.

望采纳...

回答2:

88/2 x (-1)=-44

回答3:

等于
-44