6/1*7 - 6/7*13 - 6/13*19 - 6/19*25-…-6/97*103A.433/567 B.532/653 C.522/721 D. 436/673
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![6/1*7 - 6/7*13 - 6/13*19 - 6/19*25-…-6/97*103A.433/567 B.532/653 C.522/721 D. 436/673](/uploads/image/z/612484-52-4.jpg?t=6%2F1%2A7+-+6%2F7%2A13+-+6%2F13%2A19+-+6%2F19%2A25-%E2%80%A6-6%2F97%2A103A%EF%BC%8E433%2F567+B%EF%BC%8E532%2F653+C%EF%BC%8E522%2F721+D%EF%BC%8E+436%2F673)
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6/1*7 - 6/7*13 - 6/13*19 - 6/19*25-…-6/97*103A.433/567 B.532/653 C.522/721 D. 436/673
6/1*7 - 6/7*13 - 6/13*19 - 6/19*25-…-6/97*103
A.433/567 B.532/653 C.522/721 D. 436/673
6/1*7 - 6/7*13 - 6/13*19 - 6/19*25-…-6/97*103A.433/567 B.532/653 C.522/721 D. 436/673
C
6/1*7-6/7*13-6/13*19-6/19*25-…-6/97*103
=(1-1/7)-(1/7-1/13)-(1/13-1/19)-(1/19-1/25)…-(1/97-1/103)
=1-1/7-1/7+1/13-1/13+1/19-1/19+1/25…-1/97+1/103
=1-2/7+1/103
=721/721-206/721+7/721
=522/721