Question

Ajutati-ma va rog,e urgent,pana la ora 21!!!

Answer 1

Răspuns:

a) BC b)i) ∉ ii) ∈ iii) ⊄ iv) ⊂ c) BC

Explicație pas cu pas:

a)

d∩g={B} => B∈d . Dar d⊂α=> B∈α

c∩f={C} => C∈c . Dar c⊂α=> C∈α

=> BC⊂ α

d∩g={B} => B∈g . Dar g⊂β=> B∈β

c∩f={C} => C∈f . Dar f⊂β=> C∈β

=> BC⊂ β

=> BC=α∩β

b)

i) D∉α ii) A∈(d,g) iii) AD⊄α iv) AD⊂(c,f)

c)

d,c⊂α => (d,c)=α

g,f⊂β => (g,f)=β

=> (d,c)∩(g,f)=α∩β=BC