O1+O2+O3+O4=360

^{->O4 = 360-325=35}

A= 3/5 . 6/7 .3/5 - 2/7 .3/5 = 3/5 . [6/7 + 3/7 - 2/7] = 3/5 . 1= 3/5                                                                               B=[-13 .2/5 + -2/9 . 2/5 +2/5 . 11/9]. 2/5 =2/5. [-13 +-2/9 + 11/9] .2/5=4/25 . -12 =-48/25                                          C=[-4/5 + 5/7] . 3/2 + [-1/5 + 2/7] .3/2 = 3/2.[ -4/5 + -1/5 + 5/7 + 2/7] = 3/2. [ -1 +1] =3/2 . 0=0                               D=4/9 . [3/5 + 3/22] = 4/9. 84/100 = 36/110 = 18 /55

P= 2/3 + 1/4 + 3/5 - 7/45 + 5/9 + 1/12 + 1/35 = 12/12 + 18/45 +[3/5 + 1/35] =1 +1 + 1/35 = 2 +1/35=71/35            Q= 5- 3/4 + 1/5 -6 -7/4 + 8/5 - 2 + 5/4 + 8/5 -16/5 =-3 - 5/4 + 11/5 = -17/4 + 11/5 =41/20

A= 1/3 -8/15- 1/7 + 2/3 - 7/15 +8/7 =[1/3 + 2/3] - [8/15 + 7/15] + [- 1/7+ 8/7] =1-1+1=1                                            B= 1/4 + 3/5 - 1/8 + 2/5 - 1/8 = [1/4-5/4] + [3/5 + 2/5] - 1/8 = -1 + 1 - 1/8= - 1/8