Ajutati-mă cu aceste fracţii, Vă rog

4/15+2/3
A doua fractie o amplifici cu 5 ca numitorul comun sa fie 15:
4/15+10/15=14/15

16/93+6/31
A doua fractie se amplifica cu 3 ca numitorul comun sa fie 93:
16/93+18/93=34/93

7/32-1/16
A doua fractie se amplifica cu 2 ca numitorul comun sa fie 32:
7/32-2/32=5/32

23/42-5/14
A doua fractie se amplifica cu 3 ca numitorul comun sa fie 42:
23/42-15/42=8/42

Si la celelalte fractii se face exact la fel ai grija sa fie numitor comun la ambele fractii
Sper ca te-am ajutat

LisaSmith327 LisaSmith327 · Answer 2 · 2018-02-25T09:21:10+02:00

Ex 2:
a)4/15+2/3=1*4+5*2/15=4+10/15=14/15
b)16/93+6/31=1*16+6*3/93=16+18/93=34/93
c)7/32-1/16=1*7+2*1/32=7+2/32=9/32
d)23/42-5/14=1*23+3*5/42=23+15/42=38/42 simplifica prin 2=19/21
Ex 3:
a)5/12+5/24=2*5+1*5/24=10+5/24=15/24 (3=5/8
b)26/21 +13/14=2*16+13*3/42=32+26/42=58/42(2=29/21
c)4/15+3/20=4*4+3*3/60=16+9/60=25/60(5=5/12
d)5/24+1/2+3/8=
5/24+1/2=1*5+12*1/24=5+12/24=17/24
17/24+3/8=1*17+3*3/24=17+9/24=26/24(2=13/12
e)7/30-3/20=2*7-3*3=14-9/60=5/60(5=1/12
F)8/15-9/20=4*8-3*9/60=32-27/60=5/60 (5=1/12
g )8/21-4/35=5*8-3*4/105=40-12/105=28/105(7=4/15
h)7/6-3/4-1/12=
7/6-3/4=2*7-3*3/12=14-9/12=5/12
5/12-1/12=4/12 (4=1/3