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1.-(6/7) (2/13) / (5/2) + 2/7= 142/455
12/182=6/91 / 5/2 = 12/455 + 2/7 = 84+910/3185 = 994/3185 = 142/455 (séptima)

2.-9/7+6/5 – 18/12 -1/5= 11/44
9/7 + 6/5 = 45+42/35=87/86 – 18/12 = 1044- 630/420= 414/420=69/70- 1/5 =345-70/350=275/350=55/70= 11/44 (quinta)

3.-3/9-16/4+25= -1
3/9-16/4=12-144/36=-32/36=16/18=8/9+25/1=8+225/9=+233/9

4.-25-16-48—76+65+82-45+12= -1
9-39-115-50+32-13-1

5.- (2)(-9)(3)(-8)(7)(-6)(5)(4)(-16)(-12)= -11612160
-18-54+432+3024-18144-90720-362880-5806080-11612160

6.-11/3+22/8-3/4= 121/24
11/3+2/8=8+66/24=154/24=77/12-3/4=308-66/48=242/48=121/24 (segunda)

7.-((13/6)) (33/4) / (19/16) + 22 -18= 362/19
429/24/19/16=6864/456+2/1= 6864+10032/456=16896/456
16896/456-18/1=16896-8208/456=8688/456(octava)=1086/57(tercera)=362/19

8.-17-13+62-(33/3)(15/3)/3)= -221/3
92/1-495/27=495-2484/27=-1989/27=-221/3 (tercera)


9.-(17)(1/5)(-4)(-6)(-2/7)(1/6)(45/6)(-2)= 408/7
17/5-68/5+408/5-816/35-816/210=36720/1260+73440/1260=(sexta)=1240/210(sexta)2040/35(quinta)=408/7

10.-15+15-48-65-36+52+89-79+62-69= -94
0-48-113-149-97-8-87-25-94