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OG19新題
【OG20-P147-8題】
(12 -13 )+(13 -14 )+(14 -15 )+(15 -16 )=
A.-16
B.0
C.13
D.12
E.23 ?
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答案：
C
(1/2-1/3)+(1
=1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6
=1/2-1/6
=1/3
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