装修问答

数学题目1× 1/2 +2× 1/3+3× 1/4+……49×1/50=?

50)=
50-1/4)+.;4-.;3-1/2)+(1-1Ǘ× 1/2 +2× 1/3+3× 1/4+……49×1/50=
(1-1/3)+(1-1/..+(1-1/.;2-1/.-1/

大唐帝国皇帝 102024-05-09