primera tarea de grupo 1-4 ya resuelta todita

1-3+4+5-6-7-4+9=4
3+4+5+9=21
-6-7-4=17
21-17=4

2- -6+4-6+2-9-8+2+3+6-8-12-43-67=-75
4+2+2+3+6=17
-6-6-6-8-8-12-43=-92
17-92=-75

3-(2)(-12)(3)(3)(-2)(1)(3)=1296
(-24)(3)
(-72)(3)
(-216)(-2)
(432)(3)
R=(1296)

4-(-2)(3)(1)(-4)(5)(6)(-7)(-8)=40,320
(-6)(1)
(-6)(-4)
(24)(5)
(120)(6)
(720)(-7)
(5040)(-8)
R=(40.320)

5- -4+5-6+7-8+9-12+24-33 (2)(-3)(4)(5)=6120
1+1+1+12-33
15-33
(-18)+(33)
(+51)(2)
(102)(-3)
(-306)(4)
(1224)(5)
R=(-6120)

6-(3/4)+(5/9)=11/36
3/4+5/9= 27+20 47/36 / 11/36
36

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

8-(3/5)(12/3) - (4/7)(6/11)= -2262/2520
3/5x12/3=9/60
4/7x6/11=44/42
9/60 - 44/42= 378/2640 = -2262/2520
2520

9-(((4/3)(6/2)(44)))+(2/5)+3/4-16/7= -14648/13440
4/3x6/2=8/18
8/18x4/4=32/72
2/3+3/4= 8+15 =23/20
20
32/72+23/20= 640+1656 =/14648/1920
1440
2296/1920 - 16/7= 16072-30720 = -14648/13440
13440

10-(185)(92)+25/3-6/4/-7/5=57450/8100
18/5x9/2=36/45
36/45+25/3= 108+1125 =1223/135
135
1223/-6/4= 4082-810 =4082/540
4082/540-7/15= 61230-3780 =57450/8100
8100

11-(14/3)/(23/11)+9/6 (5/4)=6501/1656= 3 1553/1656
14/3+23/11=154/69
9/6x23/11=45/24
154/69+45/24= 3396+3105 =6501/1656
1656

12-(((5/25)(16/2)/(25/7)(13/6)(12/7)))+3/2=
(5/25)x16/2)=80/50
(25/7x13/16)=325/112
80/50 / 325/112=8960/16250
8960/16250 / 12/7=6272/195,000
62720/195,000+3/2= 125,440+585,000 =710,440/390,000
390,000