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(-1)+(+2)+(-3)+(+4)+(-5)+(+6)+(-7)+(+8)+(-9)+(+10

Răspuns :

19999991
(-1)+(+2)+(-3)+(+4)+(-5)+(+6)+(-7)+(+8)+(-9)+(+10)
=-1+2-3+4-5+6-7+8-9+10
=1-3+4-5+6-7+8-9+10
=-2+4-5+6-7+8-9+10
=2-5+6-7+8-9+10
=-3+6-7+8-9+10
=3-7+8-9+10
=-4+8-9+10
=4-9+10
=-5+10
=5

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