5/7*5/8+3/8=5/7*(5/8+3/8)=5/7
3/8*0,25+1/4*5/8-1/4=3/8*1/4+1/4*5/8-1/4=1/4*(3/8+5/8-1)= 0
14/9*7/23*9/14=(14/9*9/14)*7/23=7/23
2/3*14*5/7=2/3*2*5=20/3
5/7*5/8+3/8=5/7*(5/8+3/8)=5/7
3/8*0,25+1/4*5/8-1/4=3/8*1/4+1/4*5/8-1/4=1/4*(3/8+5/8-1)= 0
14/9*7/23*9/14=(14/9*9/14)*7/23=7/23
2/3*14*5/7=2/3*2*5=20/3