Question

urgenteeeee pfvvvv???????​

Answer 1

Resposta:

A) -25

B)

$- \frac{7}{4}$

C) 126

Explicação passo-a-passo:

a) 2x + 3y

= 2×5 + 3×(-5)

= 10 + (-15)

= -25

b)

${x}^{ - 1} - {x}^{\frac{1}{2} }$

$4 ^{ - 1} - 4 ^{ \frac{1}{2} }$

$\frac{1}{4} - \sqrt{4} \\ = \frac{1} {4} - 2 \\\ = \frac{1 - 8}{4} = - \frac{7}{4}$

c)

$3x ^{3} y^{2} - 5xy^{2}$

$3 \times 2 ^{3} \times 3^{2} - 5 \times 2 \times 3^{2}$

$3 \times 8 \times 9 - 5 \times 2 \times 9 \\ = 216 - 90 = 126$