100-98+96-94+92-90+88-86依次类推减到2等于多少

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100-98+96-94+92-90+88-86依次类推减到2等于多少
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100-98+96-94+92-90+88-86依次类推减到2等于多少
100-98+96-94+92-90+88-86依次类推减到2等于多少

100-98+96-94+92-90+88-86依次类推减到2等于多少

100-98+96-94+92-90+88-86.+4-2
=(100-98)+(96-94)+(92-90)+(88-86).+(4-2).共计25组
=2×25
=50

100-98+96-94+92-90+88-86··············+4-2
=(100-98)+(96-94)+(92-90)+(88-86)··············+(4-2)
=2*25
=50