问题
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:[6/(1×7)]-[6/(7×13)]-[6/(13×19)]-[6/(19×25)]-……-[6/(97×103)]= ()A.433/567B.532/65
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2,4,6,9,13,19,()A. 28 B. 29 C. 30 D. 31
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2,4,6,9,13,19,() A. 28 B. 29 C. 30 D. 31
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2,4,6,9,13,19 ()。A. 28B. 29C. 30D. 31
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2,4,6,9,13,19 ()。A. 28B. 29C. 30D. 31
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5+3=28 9+1=810 8+6=214 5+4=19,那么7+3=?