Tìm X biết X = 17/23*8/16*23/17*(-80)*3/4

1. Tìm X biết
A. X=17/23*8/16*23/17*(-80)*3/4
B, (13/23+1313/2323-131313/232323)*(1/3+1/4-7/12)=2x+1
C, (31/20-26/45)*-36/35>x>(51/56+8/21+1/3)*8/13
D, (1/7-1/3)*x=28/3*(1/4-1/7)
E, (2/11+1/3)*x= (1/7-1/8)*56