一個分之1 等於幾個分之1 求幾個數 (15395)

D2:M9=IF(COLUMN(A1)>$C2,"",IF(COLUMN(A1)=$C2,$B2+$C2-1,PRODUCT($B2+COLUMN(A1)-{0,1})))

O2:O9{=SUM(IFERROR(1/D2:M2,))=1/B2