Question

1 Determinati numărul natural x, care verifică relaţia: 4) (x+1)|9: b) (x-2)(15; c) (2x-3) 21 4) (2x+1)|25 e) (2x-1)|15 (2x+1)35​

Answer 1

Răspuns:

(x+1)|9

x=9-1

x=8

Verificare: (8+1)|9=9|9

(x-2)|15

x=15+2

x=17

Verificare: (17-2)|15=15|15

(2x-3)|21

2x=21+3

2x=24

x=24:2

x=12

Verificare: (2•12-3)|21=21|21

(2x+1)|25

2x=25-1

2x=24

x=24:2

x=12

Verificare:(2•12+1)|25=25|25

(2x-1)|15

2x=15+1

2x=16

x=16:2

x=8

Verificare:(2•8-1)|15=15|15

(2x+1)|35

2x=35-1

2x=34

x=34:2

x=17

Verificare:(2•17+1)|35=35|35