Срочно. Заранее, спасибо.

$=158( \frac{12*(1-1/7-1/289-1/85)}{4(1-1/7-1/289-1/85y)} : \frac{5(1+1/13+1/169+1/91)}{6(1+1/13+1/169+1/91)} )* \frac{505505505}{711711711} =$

$=158(12/4:5/6)* \frac{505505505}{711711711} =158(3*6/5)*\frac{505505505}{711711711} =$

$= \frac{158*3*6*505505505}{5*711711711}$ $= \frac{158*3*6*101101101}{711711711}$ =

$= \frac{158*6*101101101}{237237237}$ = $= \frac{6*101101101}{1501501,5}$ = $= \frac{606606606}{1501501,5}$ = $= \frac{6066066060}{15015015}$ =

$= \frac{404404404}{1001001}$ =404