5/9-1/25+4/9-4/25=(5/9+4/9)-(1/25+4/25)=1-1/5=4/5
5/9-1/25+4/9-4/25=(5/9+4/9)-(1/25+4/25) =1-1/5 =4/5
5/9-1/25+4/9-4/25=5/9+4/9-1/25-4/25=1-1/5=4/5