Question

现有1,2,3,.15,16共16个数字,试在某些数字前面加负号,是它们的和为零

Answer 1

很多种,例如：

1+2+3+4+5+6+7+8+9+10-11-12+13-14-15-16 = 0

1+2+3+4+5+6+7+8+9-10+11+12-13-14-15-16 = 0

1+2+3+4+5+6+7-8+9-10-11-12-13-14+15+16 = 0

1+2+3+4+5+6+7-8-9+10-11-12-13+14-15+16 = 0

1+2+3+4+5+6+7-8-9-10+11-12+13-14-15+16 = 0

1+2+3+4+5+6+7-8-9-10+11-12-13+14+15-16 = 0

1+2+3+4+5+6+7-8-9-10-11+12+13-14+15-16 = 0

1+2+3+4+5+6-7+8+9-10-11-12-13+14-15+16 = 0

-1-2-3-4-5-6+7-8-9+10+11+12+13-14+15-16 = 0

-1-2-3-4-5-6-7+8+9+10+11-12-13+14-15+16 = 0

-1-2-3-4-5-6-7+8+9+10-11+12+13-14-15+16 = 0

-1-2-3-4-5-6-7+8+9+10-11+12-13+14+15-16 = 0

-1-2-3-4-5-6-7+8+9-10+11+12+13-14+15-16 = 0

-1-2-3-4-5-6-7+8-9+10+11+12+13+14-15-16 = 0

-1-2-3-4-5-6-7-8-9+10-11-12+13+14+15+16 = 0

-1-2-3-4-5-6-7-8-9-10+11+12-13+14+15+16 = 0