Question

Rezolvă, în Q, ecuațiile:
a) - 0,5x= -7,5
b) - - 5/2 y = 1/4
c) 1,4z= - 7/2
d) 6/5u =0,8
e) 9,9:x = - 3
f) x : (- 6/7) =13/6
g) -1,6 : x = 0,8
h) y : 5/2 = 3,4

Vă implorrr, ajutați-mă, dau coroană! Plsss ​

Answer 1

Răspuns:

$\bf a)~ - 0,5x= -7,5$

$\bf x = - 7,5 : ( - 0,5) \implies \red{\underline{x = 15}}$

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$\bf b)~ - \dfrac{5}{2} y = \dfrac{1}{4}\implies -5y\cdot 4= 1\cdot 2$

$\bf - 20y = 2 \implies\blue{\boxed{\bf y = - \dfrac{1}{10}}}$

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$\bf c)~1,4z = -\dfrac{7}{2}$

$\bf 1,4z = - 3,5 \implies \purple{\underline{z = - 2,5}}$

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$\bf d)~ \dfrac{6}{5}u = 0,8\implies \bf 1,2u = 0,8$

$\bf u = 0,8 :1,2\implies \green{\underline{u = 0,666}}$

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$\bf e)~9,9: x = - 3 \implies \dfrac{99}{10}:x = - 3$

$\bf \dfrac{99}{10}\cdot \dfrac{1}{x}=- 3\implies \dfrac{99}{10x}=-3$

$\bf- 30x=99\implies x=-\dfrac{~99^{(3}~}{30}$

$\pink{\boxed{\bf x=-\dfrac{33}{10}}}$

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$\bf f)~x:\Big(-\dfrac{6}{7}\Big)=\dfrac{13}{6}$

$\bf -x\cdot \dfrac{7}{6}=\dfrac{13}{6}\implies -7x= 13$

$\purple{\boxed{\bf x= -\dfrac{13}{7}}}$

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$\bf g)~- 1,6x = 0,8 \implies$

$\bf x=(-1,6):0,8\implies \red{\underline{x = -2}}$

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$\bf h)~ y : \dfrac{5}{2} = 3,4 \implies y\cdot\dfrac{2}{5} = 3,4$

$\bf 2y=3,4 \cdot 5\implies 2y = 17$

$\blue{\boxed{\bf y = \dfrac{17}{2} }}$

==pav38==