这个数=(3/4+2/5)÷3/8=46/15
3/4+ 2/5 =3/8X3/8X=23/20X=46/15验算:右边3/8X46/15=23/20 左边=23/20
46/15
(3/4+2/5)/(3/8)=(23/20)/(3/8)=46/15
(3/4+2/5)x3/823/20x8/3=184/60=46/15