Ma nevoie de ajutor!

Răspuns: Bine te ajut la toate dar deja ai raspunsul la una in cealalta postare.
Explicație pas cu pas: b)
a-b=1/12
a=8/9
32/36-b=3/36
b=29/36
a)7/3-5/13= 91/39-15/39=76/39
b)9/10:3/16=9/10*16/3=3/10*16/1=3/5*8/1=24/5
c)53/81-7/27=53/81-21/81=32/81
d)81/18-63/36=162/36-63/36=99/36
e) scz la e nu se vede daca ai nevoie de el fa o alta poza