Question

Dau coroana! + 20 de pct!
Determinați mulțimile:

Answer 1

Răspuns:

A={3}

B={2}

C={1}

2x+3=5

2x=5-3

2x=2

x=2:2

x=1

D={1/3}

2-3x=1

-3x=1-2

-3x=-1/×(-1)

3x=1

x=1/3

E={5}

5+x=0

x=0-5

x=-5=>|-5|=5

F={8}

4-x=-4

-x=-4-4

-x=-8/×(-1)

x=8