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Calculati:
3
_× + 1 =13
4


Răspuns :

3/4*x+1=13
3x+4= 52
3x=52-4
3x=48 | : 3
x=16
3/4x+1=13⇒3x+4/4=13⇒3x+4=13×4⇒3x+4=52⇒3x=52-4⇒3x=48⇒x=48/3⇒x=16
sucees