1-(2-3)-(4-5)-(6-7)-……-(98-99)=

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1-(2-3)-(4-5)-(6-7)-……-(98-99)=
1-(2-3)-(4-5)-(6-7)-……-(98-99)=

1-(2-3)-(4-5)-(6-7)-……-(98-99)=
50

—4950

50

=1-2+3-4+5-6+7-.....-98+99
=1+1+1+.......+1
=1×50
=50

1+49*1=50

1

50

50,绝对正确,其实是50个1相加