100-99+98-97+96-95+……+4-3+2-1=________.

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100-99+98-97+96-95+……+4-3+2-1=________.100-99+98-97+96-95+……+4-3+2-1=________.100-99+98-97+96-95+……+

100-99+98-97+96-95+……+4-3+2-1=________.
100-99+98-97+96-95+……+4-3+2-1=________.

100-99+98-97+96-95+……+4-3+2-1=________.
=(100-99)+(98-97)……+(2-1)
=1+1+1+……+1(共50项)
=50

50

50

(100-99)+(98-97)......+(4-3)+(2-1)
=1+1+1......+1+1
=1x50
=50

=(100-99)+(98-97)……+(2-1)
=1+1+1+……+1(共50项)
=50 *1
=50