1+2+3+4……+9999999+10000000-9999-8888-7777-6666-5555-4444-3333-2222-1111=?

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1+2+3+4……+9999999+10000000-9999-8888-7777-6666-5555-4444-3333-2222-1111=?
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1+2+3+4……+9999999+10000000-9999-8888-7777-6666-5555-4444-3333-2222-1111=?
1+2+3+4……+9999999+10000000-9999-8888-7777-6666-5555-4444-3333-2222-1111=?

1+2+3+4……+9999999+10000000-9999-8888-7777-6666-5555-4444-3333-2222-1111=?
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

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