👤

La mate avem:
5•X+7=272
5•(X-3)=215
2•{3•[4•(5•X+1)-3]-2}=2


Răspuns :

5×X+7=272
5X=272-7
5X=265
X=265÷5
X=53

5(X-3)=215
5X-5×3=215
5X-15=215
5X=215-15
5X=200
X=200÷5
X=40