Question

1 rezolvati in Q ecuatiile:
a) x+5=7
b) 7-x=2
c) 2 supra 3 si x intregi + 3=1

Answer 1

Răspuns:

x+5=7

x=7-5

x=2

7-x=2

7-2=x

x=5

2/3+x+3=1 / x3

2+3x+9=3

11+3x=3

3x=3-11

3x=-8

x=-8/3

Answer 2

$a)\,\,\,x+5 = 7 \Rightarrow x = 7-5 \Rightarrow \boxed{x = 2}$

$b)\,\,\,7-x = 2 \Rightarrow 7-2 = x \Rightarrow \boxed{x = 5}$

$c)\,\,\,\dfrac{2}{3}+x+3 = 1\Big|\cdot 3\Rightarrow 2+3x+9 = 3 \Rightarrow 3x = 3-11 \Rightarrow \\ \Rightarrow 3x = -8 \Rightarrow \boxed{x = -\dfrac{8}{3}}$