1-2+3-4+5.+99-100
问题描述:
1-2+3-4+5.+99-100
答
1-2+3-4+5.+99-100 = (1-2) + (3-4) + (5-6) + .+ (99-100) = (-1) * 100/2 = -50
1-2+3-4+5.+99-100
1-2+3-4+5.+99-100 = (1-2) + (3-4) + (5-6) + .+ (99-100) = (-1) * 100/2 = -50