Question

Boa Noite!
Livro de Matemática Bianchini.

Página 112 - Exercício 63
63- Resolva as equações, sendo U=Q
A- B- C-

Answer 1

a) $\dfrac{3x}{5}-\dfrac{1}{2}=x-\dfrac{2}{5}$

$\dfarc{6x-5}{10}=\dfrac{10x-4}{10}$

$6x-5=10x-4$

$6x-10x=-4+5$

$-4x=1$

$x=\dfrac{-1}{4}$


b) $\dfrac{x}{2}+\dfrac{3}{4}=\dfrac{2x}{6}-\dfrac{1}{3}$

$\dfrac{2x+3}{4}=\dfrac{x-1}{3}$

$3(2x+3)=4(x-1)$

$6x+9=4x-4$

$2x=-4-9$

$2x=-13$

$x=\dfrac{-13}{2}$


c) $\dfrac{3y}{2}-1=\dfrac{3}{4}-2y$

$\dfrac{3y-2}{2}=\dfrac{3-8y}{4}$

$\dfrac{2(3y-2)}{4}=\dfrac{3-8y}{4}$

$2(3y-2)=3-8y$

$6y-4=3-8y$

$6y+8y=3+4$

$14y=7$

$y=\dfrac{7}{14}$

$y=\dfrac{1}{2}$

Answer 2

As respostas estão na imagem .