1/9X10+1/10X11+1/11X12+1/12X13+…+1/17X18
=1/9-1/10+1/10-1/11+1/11-1/12+1/12-1/13+...+1/17-1/18
=1/9-1/18
=1/18
1/9X10+1/10X11+1/11X12+1/12X13+…+1/17X18=
2个回答
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