Question

Efetue

A- 5 = 18
X 27

B- 5 = 32
12 X+4

C- 3 = 4
X+2 5

D- 16 = 45
14 X

E- 8 = X+3
14 2X+2

F- 4X-3 = 3
X+2 10

Answer 1

Bom dia!

para resolver, basta multiplicar cruzado

letra a:

$\frac{5}{x}=\frac{18}{27} \\ \\ 18x= 27.5 \\ x=\frac{135}{18} \\ \\ \boxed{x= 7,5}$

letra b:

$\frac{5}{12}= \frac{32}{x+4} \\ \\ 5(x+4}=12.32 \\ 5x+20= 384 \\ 5x= 384-20 \\ \\ x=\frac{364}{5} = \boxed{72,8}$

letra c:

$\frac{3}{x+2}=\frac{4}{5} \\ \\ 4(x+2)= 3.5 \\ 4x+8= 15 \\ 4x= 15-8 \\ \\ \boxed{x= \frac{7}{4} = 1,75}$

letra d:

$\frac{16}{14}=\frac{45}{x} \\ \\ 16x= 45.14 \\ \\ x=\frac{630}{16} =\boxed{39,1}$

letra e:

$\frac{8}{14}=\frac{ x+3}{2x+2} \\ \\8(2x+2)= 14(x+3) \\ 16x+16= 14x+42 \\ 16x-14x= 42-16 \\ 2x= 26 \\ \\ x= \frac{26}{2} \\ \\\boxed{ x= 13}$

letra f:

$\frac{4x-3}{x+2}=\frac{3}{10} \\ \\ 10(4x+3)= 3(x+2)} \\ 40x+30= 3x+6 \\ 40x-3x= 6-30 \\ 37x= -24 \\ \\ \boxed{x=-\frac{24}{37}= -0,6}$