Question

Ajutor!!!@
Ex 3.112
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Answer 1

[(n×5)+15]:5=5

[(n×5)+15]=5×5=25

(n×5) =25-15=10

n=10:5

n=2

Answer 2

Notez:

Numărul l a care m am gândit = a

REZOLVARE:

a×5=5a

[ ( 5a + 15 ) :5 ] -5 =5

( 5a + 15 ) :5 = 5+5

( 5a + 15 ) : 5 = 10

5a + 15 = 5 ×10

5a + 15= 50

5a= 50 -15

5a=35

a=35: 5

a= 7

VERIFICARE:

7×5=35

35+15=50

50:5=10

10-5=5

Coroană ?