Question 28701
-3/5[2/3-1/2(3/4-1/2)]
=-3/5[2/3-(1/2)X(3/4)+(1/2)X(1/2)]
=-3/5[2/3-3/8+1/4]
=-3/5[(2X8)-(3X3)+(1X6)]/24  (the lcm of 3,8 and 4 is 24 and hence  multiplying every nr and  dr of every term by 24)
=(-3/5)X[(16-9+6)/24]
=(-3/5)X[13/(3X8)]
=(-13)/40  (canceling 3)(and multiplying 5 and 8 in the dr.
Answer:(-13/40)