1+2+3+4……+9999999+10000000-9999-8888-7777-6666-5555-4444-3333-2222-1111=?
问题描述:
1+2+3+4……+9999999+10000000-9999-8888-7777-6666-5555-4444-3333-2222-1111=?
答
d
答
不繁
答
1+2+3+4……+9999999+10000000=(1+10000000)*10000000/2=50000005000000-9999-8888-7777-6666-5555-4444-3333-2222-1111=-49 995则为:50000005000000-49995=50000004950005