Question

Determine o valor numérico de:


Exemplo 1: 8x-13 com x=2

Resposta: 8.2-13= 16-13= 3


Exemplo 2: 6x+10w-60 com x=5 e w=3

Resposta: 6.5+10.3-60= 30+30-60= 0


a) 8-4x com x=5

b) 3y-11 com y=10

c) 9x-3y com x=11 e y=3

d) 5y+w-x com y=5e w=15 e x=20​

Answer 1

Resposta:

a) -12

b) 19

c) 90

d) 20

Explicação passo-a-passo:

a)

$\mathbf{8 - 4x}$

$\mathbf{8 - 4 \times 5}$

$\mathbf {8 - 20}$

$\mathbf {\boxed{\boxed{-12}}}$

b)

$\mathbf {3y - 11}$

$\mathbf {3 \times 10 - 11}$

$\mathbf{30 - 11}$

$\mathbf{\boxed{\boxed{19}}}$

c)

$\mathbf{9x - 3y}$

$\mathbf{9 \times 11 - 3 \times 3}$

$\mathbf {99 - 9}$

$\mathbf{\boxed{\boxed{90}}}$

d)

$\mathbf{5y + w - x}$

$\mathbf{5 \times 5 + 15 - 20}$

$\mathbf {25 + 15 - 20}$

$\mathbf{40 - 20}$

$\mathbf{\boxed{\boxed{20}}}$