1)=13*72/65-15,3=72/5-15,3=14,4-15,3=-0,9
2)=(25/3)*(3/25)*3,5 *1/80 *6,25=1/80 * 7/2 *25/4=175/640=35/88
3)=17*151/68-37,9= 151/4-37,9=37,75-37,9=-0,15
4)=((72/10))*7/12)*27/10 *((72/50)*5/14*(125))=4,2*2,7 *(72/2*1/14 *25)=4,2*2,7*36*25* (1/14)=729