Question

Rezolvați ecuațiile:
a) x-3,25=7 supra 4
b) 2,35+x=3 intregi si 1 supra 4
c) 3,2-x=6 supra 5

Answer 1

a) $x-3,25 =\dfrac{7}{4} \Rightarrow x-3,25=1,75 \Rightarrow x=1,75+3,25 \Rightarrow x=5 .$

b) $2,35+x=3\dfrac{1}{4}\Rightarrow 2,35+x =3,25 \Rightarrow x=3,25-2,35 \Rightarrow x=0,9$

c)
[tex]3,2-x=\dfrac{6}{5}|_{\cdot 5} \Longrightarrow 16-5x=6 \Longrightarrow 16-6=5x \\\;\\ \Longrightarrow 10=5x \Longrightarrow x=2[/tex]

Sau:

$3,2-x=\dfrac{6}{5}\Longrightarrow 3,2-x=1,2\Longrightarrow x=3,2 -1,2 \Longrightarrow x=2$

Sau:

[tex]3,2-x=\dfrac{6}{5}\Longrightarrow \dfrac{\ 32^{(2}}{10}-x=\dfrac{6}{5} \Longrightarrow \dfrac{16}{5}-x=\dfrac{6}{5} \\\;\\ \Longrightarrow \dfrac{16}{5}=\dfrac{6}{5}+x \Longrightarrow x+\dfrac{6}{5} =\dfrac{16}{5}\Longrightarrow x=\dfrac{16}{5}-\dfrac{6}{5} \Longrightarrow x=\dfrac{10}{5} \\\;\\ \Longrightarrow x=2.[/tex]
.

Answer 2

x-3.25=7/4⇒4×(x-3.25)=7⇒4x-13⇒7⇒4x=-13-7⇒4x=-20⇒x=-20/4⇒x=-5

2.35+x=31/4⇒2.35+x=13/4⇒4×(2.35+x)=13⇒9.4+4x=13⇒4x=13-9.4⇒4x=3.6⇒x=3.6/4

3.2-x=6/5⇒5×(3.2-x)=6⇒16-5x=6⇒-5x=-16+6⇒-5x=-10⇒x=-10/-5⇔x=2
sucees