Question

1 pe 2 + 1 pe 3 =???

1pe2 +1pe 3+1pe 4 =???

1pe 2 +1pe3 +1pe4+1pe5 =??


Repede!!

Answer 1

1/2 + 1/3 =(3+2)/6=5/61/2 +1/3+1/4 =(6+4+3)/12=13/12

1/2 +1/3 +1/4+1/5 =(30+20+15+12)/60=77/60

Answer 2

1/2 + 1/3= 
2=2
3=3
c.m.m.m.c ( 2,3 )= 2*3=6
1/2= 6:2=3
1/3=6:3=2
1/2 + 1/3= ( 3*1) / (3*2) + ( 2*1) / ( 2*3)=
3/6 + 2/6=
(3+2) / 6= 5/6

1/2+1/3+1/4=
2=2
3=3
4=2²
c.m.m.m.c ( 2,3,4 )= 2*3*2²= 2*3*4= 6*4=24
1/2=24:2=12
1/3=24:3=8
1/4=24:4=6
1/2+1/3+1/4= ( 12*1) / ( 12*2) + ( 8*1) / ( 8*3) + ( 6*1) / ( 6*4)=
12/24 + 8/24 + 6/24=
(12+8+6) / 24= 26/4 se simplifica cu 2 si ne da 13/2

1/2 + 1/3 + 1/4 + 1/5=
2=2
3=3
4=2²
5=5
c.m.m.m.c (2,3,4,5)= 2*3*4*5=24*5=120
1/2= 120:2=60
1/3= 120:3=40
1/4= 120:4=30
1/5= 120:5=24
1/2+1/3+1/4+1/5= 60/120 + 40/120 + 30/120 + 24/120= ( 60+40+30+24) / 120= 154/120 se simplifica cu 2 si ne da 77 / 60
SPER CA TE-AM AJUTAT!