5/11 + 9/12=
5 / 11 + 9 / 12 =
( 5 * 12 + 9 * 11 ) / ( 11 * 12 )=
( 60 + 99 ) / 132 =
159 / 132 =
( 3 * 53 ) / ( 3 * 44 ) =
53 / 44 =
( 44 + 9 ) / 44 =
1 9 / 44 =
( 5 * 12 + 9 * 11 ) / ( 11 * 12 )=
( 60 + 99 ) / 132 =
159 / 132 =
( 3 * 53 ) / ( 3 * 44 ) =
53 / 44 =
( 44 + 9 ) / 44 =
1 9 / 44 =