1/2/(2/3)*3/4-3/8 5/12*8/25+8/25/(12/7) 3/10/(3/4-1/2)*5/8
=1/2*3/2*3/4-3/8 =2/15*14/75 =3/10/(1/4)*5/8
=3/4*3/4-3/8 =8/25 =3/4
=9/16-3/8
=9/16-6/16
=3/16
1/2/(2/3)*3/4-3/8 5/12*8/25+8/25/(12/7) 3/10/(3/4-1/2)*5/8
=1/2*3/2*3/4-3/8 =2/15*14/75 =3/10/(1/4)*5/8
=3/4*3/4-3/8 =8/25 =3/4
=9/16-3/8
=9/16-6/16
=3/16