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Maria23322
a fost răspuns

Demonstrați ca valorile reale ale lui x sunt adevărate
a)2x+5=13
b)4x+7=31
c)3x+7=16
d)-2x+5=11
e)2x-9=-17
f)5x+6=-14
(​cls.7)

Răspuns :

Dianageorgiana794

Răspuns:

[tex]a)2x+5=13= > 2x=13-5= > x=8:2= > x=4\\ \\b)4x+7=31= > 4x=31-7= > x=24:4= > x=6\\\\c)3x+7=16= > 3x=16-7= > x=9:3= > x=3\\\\d)-2x+5=11= > -2x=11-5= > x=6:2= > x=-3\\\\e)2x-9=-17= > 2x=-17+9= > x=-8:2= > x=-4\\\\f)5x+6=-14= > 5x=-14-6= > x=-20:5= > x=-4[/tex]

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