原式=5/4×3/10+5/4×4/26+5/8=3/8+5/8+5/26=1又5/26
10÷[8/3-(5/13*26/5+2/5]=10÷[8/3-(2+2/5)]=10÷[8/3-12/5]=10÷(40/15-36/15)=10÷4/15=10*15/4=75/2
5/4*(3/10)+5/8=1