Question

-36×=12
-×=3
-7×=-14

Answer 1

a)

$\Box \ \ \boxed{\begin{array}{l}\sf -36x=12 \ ? \end{array}}\\\\\\\\\Box \ \ \boxed{\begin{array}{l}\sf 36x=-12 \end{array}}\\\Box \ \ \boxed{\begin{array}{l}\sf x=\frac{-12}{36} \ \ \checkmark \end{array}}$

resposta correta;

$x=\frac{-12}{36}$

ou

-0.333,333,333,33

b)

$\Box \ \ \boxed{\begin{array}{l}\sf -x=3 \ ? \end{array}}\\\\\\\Box \ \ \boxed{\begin{array}{l}\sf x=-3 \ \ \checkmark \end{array}}$

resposta correta;

x=-3

c)

$\Box \ \ \boxed{\begin{array}{l}\sf -7x=-14 \ ? \end{array}}\\\\\\\Box \ \ \boxed{\begin{array}{l}\sf 7x=14 \end{array}}\\\Box \ \ \boxed{\begin{array}{l}\sf x=\frac{14}{7} \ \checkmark \end{array}}\\\Box \ \ \boxed{\begin{array}{l}\sf x=2 \ \checkmark \end{array}}$

resposta correta;

$x=\frac{14}{7}$

ou

$x=2$

prova real;

a)

$\Box \ \ \boxed{\begin{array}{l}\sf -36x=12 \end{array}}\\\Box \ \ \boxed{\begin{array}{l}\sf 35x=-12 \end{array}}\\\Box \ \ \boxed{\begin{array}{l}\sf 0.333,333,333,33 \ . \ 36=-12 \end{array}}\\\Box \ \ \boxed{\begin{array}{l}\sf 12=-12 \end{array}}\\\Box \ \ \boxed{\begin{array}{l}\sf \rightarrow \ =-12-12 \end{array}}\\\Box \ \ \boxed{\begin{array}{l}\sf \rightarrow \ =\boxed{\begin{array}{l}\sf 0 \ \checkmark\end{array}} \end{array}}$

$b)\\\Box \ \ \boxed{\begin{array}{l}\sf -x=3 \end{array}}\\\Box \ \ \boxed{\begin{array}{l}\sf x=-3 \end{array}}\\\Box \ \ \boxed{\begin{array}{l}\sf -3=-3 \end{array}}\\\Box \ \ \boxed{\begin{array}{l}\sf \rightarrow \ =-3+3 \end{array}}\\\Box \ \ \boxed{\begin{array}{l}\sf \rightarrow \ = \boxed{\begin{array}{l}\sf 0 \ \checkmark\end{array}} \end{array}}$

$c)\\\Box \ \ \boxed{\begin{array}{l}\sf -7x=-14 \end{array}}\\\Box \ \ \boxed{\begin{array}{l}\sf 7x=14 \end{array}}\\\Box \ \ \boxed{\begin{array}{l}\sf 2 \ . \ 7=14 \end{array}}\\\Box \ \ \boxed{\begin{array}{l}\sf 14=14 \end{array}}\\\Box \ \ \boxed{\begin{array}{l}\sf \rightarrow \ =14-14 \end{array}}\\\Box \ \ \boxed{\begin{array}{l}\sf \rightarrow \ =\boxed{\begin{array}{l}\sf 0 \ \checkmark \end{array}} \end{array}}$

respostas corretas $\checkmark$;

a)

$x=\frac{14}{7}$

ou

-0.333,333,333,33

b)

x=-3

c)

$x=\frac{14}{7}$

ou

x=2

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