6/1*7 - 6/7*13 - 6/13*19 – 6/19*25-…-6/97*103选项 A.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*103选项 A.433/567 B.532/653 C.522/721 D. 436/673](/uploads/image/z/612485-53-5.jpg?t=6%2F1%2A7+-+6%2F7%2A13+-+6%2F13%2A19+%E2%80%93+6%2F19%2A25-%E2%80%A6-6%2F97%2A103%E9%80%89%E9%A1%B9+A%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*103选项 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*103
选项 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*103选项 A.433/567 B.532/653 C.522/721 D. 436/673
6/1*7=1-1/7
6/7*13=1/7-1/13
……
6/97*103=1/97-1/103
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)-……-(1/97-1/103)
=1-1/7-1/7+1/103
=5/7+1/103
=522/721
故选C.522/721