0,75+1/28+5/7 0,256+1/2-3/4 8/15+1/3-0,2 0,741+1/4+0,009

0,75+1/28+5/7=0,75+1/28+20/28=0,75+21/28=0,75+3/4=0,75+0,75=1,50,256+1/2-3/4=0,256+2/4-3/4=0,256-1/4=0,256-0,25=0,0068/15+1/3-0,2=13/15-1/5=10/15=2/30,741+1/4+0,009=0,741+0,25+0,009=1