17:(3/9+1/4)+(7/8-1/4)*(4/5)

17:(3/9+1/4)+(7/8-1/4)*(4/5)=29 9/14

1)3/9+1/4=(3*4+1*9)/(4*9)=(12+9)/36=21/36=7/12
2)7/8-1/4=(7*1-1*2)/8=)(7-2)/8=5/8
3)17:(7/12)=17*12/7=204/7
4)5/8*4/5=4/8=1/2
5)204/7+1/2=(204*2+1*7)/(7*2)=(408+7)/14=415/14=29 9/14