1)R=142/455
12/182 / 5/2=24/910+2/7=168+1820/6370=1988/6370
=994/3185=142/455

2)R=11/14
45+42/35=87/35-18/12=1044-630/420=41=4/420-1/5/
=2070-420/2100=1650/2100=330/420=66/84=11/14

3)R=172/6
12-144/36=132/36+25/1=132+900/36=172/6

4)R=-1
9- 39 -115 -50 32 -13 -1

5)R=11612160
-18 -54 432 3024 -18144 -90720 -362880 -5806080 11612160

6)R=17/3
88+66/24 -3/4=616-72/96=68/12=17/3

7)R=362/19
(429/24)/(19/16)=6864/456+22/1=6864+10032/456
=16896/456-18/1=16896-8208/456=8688/456

8)R=33/3
17-13/1= =4/1+62/1=4+62/1=66/1-495/9=594-495/9
=99/9=33/3

9)R=73440/1260
(17/5)(24/1) (-2/42)(90/6)
(408/5) (-180/252)
(-73440/1260)

10)R=-94
-0 -48 -113 -149 -97 -8 -87 -25 -94