Question

Daca c×(3+d) =140sic×d=125calculeaza pe c. Multutumesc ptr ajutor

Answer 1

c×(3+d)=140
c×d=125
c×(3+d)=
c×3+c×d=140
=>140-125=15(c×3)
=>15c=3c
=>c=15:3 => c=5

Answer 2

c × ( 3 + d) = 140   si   c × d = 125 
→ aplic distributivitatea inmultirii fata ( in raport) de adunare:inmultesc pe c cu fiecare termen al sumei si insumez produsele

3 × c + c × d = 140 

3 × c + 125 = 140 

3 × c  = 140 - 125 

3 × c = 15 

c = 15 : 3 

c = 5