Question

Rezolva problemele prin metoda inversa apoi rezolva problemele prin metoda inversa apoi prin ecuatii:a)Citi calatori erau intr-un tren daca la o statie au coborit jumatate dintre ei au urcat 12 si acum sint 163

Answer 1

Fie x nr de calatori. 
x-x/2 +12 = 163
x-x/2= 163-12
x-x/2= 151
aducem la acelasi numitor comun :
2x-x=151*2
x=302
Verificare
302-302/2+12= 302-151+12=151+12=163

Answer 2

(163-12)*2=302 calatori
(302:2)+12=163 calatori

(x:2)+12=163 calatori
x:2=163-12
x-2=151 
x=151*2
x=302 calatori
 
302-151+12=163 calatori