tarea del grupo 1-4

1-R=3+4=+7+5=+12-6=+6-7=-1-4=-5+7=+2-4=-2+9=+7

2-R=-6+4=-2-6=-8+2=-6-9=-15-8=-23+2=-21+3=-18+6=-12-8=-20-12=-32-43=-75+67=-8

3-R=(2)(-12)=-24(3)=-72(3)=-126(-2)=218(1)=218(3)=+654

4-R=(-2)(3)=-6(1)=-6(-4)=+24(5)=+120(6)=+720(-7)=-5040(-8)=+40320

5-R=-4+5=+1-6=-5+7=+2-8=-6+9=+3-12=-9+24=+15-33=-18(2)=-36(-3)=+108(4)=432(5)=+2160

6-R=(3/4)+(5/9)=27+20/36=47/36

7-R=(6/2)-14/4)=24-28/8=-4/8=-2/4=-1/2

8-R=(3/5)(12/3)-(4/7)(6/11)=
(3/5)(12/3)=36/15
(4/7)(6/11)=24/44=6/11
36/15-6/11=396-90/165=306/165

9-R=(((4/3)(6/2)/(4/4)))+(2/5)+3/4-16/7=(4/3)(6/2)=24/6=8/2=4/1/(4/4)=16/4=8/2=4/1+(2/5)=20+2/5=22/5+3/4=88+15/20=103/20-16/7=721-320/140=401/140

10-R=(18/5)(9/2)+25/3-6/4-7/15=(18/5)(9/2)=162/10=81/5+25/3=243+125/15=368/15-6/4=1472-90/60=1382/60-7/15=20730-420/900=20310/900=6770/300=3385/150=677/30

11-R=(14/3)/(23/11)+9/6(5/4)=(14/3)/(23/11)=154/69+9/6=160+621/414=781/414(5/4)=3905/1656

12-R=(((5/25)(16/2)/(25/7)(13/6))/(12/7)+3/2=(5/25)(16/2)=80/50=40/25/(25/7)=280/625=56/125(13/6)=128/750/(12/7)=5096/9000=2548/4500=1274/2250=637/1125+3/2=1274+3375/2250=4649/2250