Question

17:(35+14)+(78-14)*(45)

Answer 1

17:(35+14)+(78-14)*(45)==17:( (12+5)/20)+( (14-4)/16)(4/5)=
=17:(17/20)+( (10*4)/(16*5)=
=(17*20)/17+2/4=
=20+0,5=
=20,5

вроде бы так :)

Answer 2

17:(3/5 + 1/4) + (7/8 - 1/4)*(4/5)= 20 1/2
17: (12/20+5/20)=17: 17/20=340/17=20
7/8-2/8=5/8
5/8*4/5=20/40=1/2
20+1/2=20 1/2