Question

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Answer 1

Resposta:???

Explicação passo-a-passo:garai,isso,não,é,ensino,basico,não....

obs:to,sem,tecla,de,espaco,e,sem,o,c,com,acento,tbm...

Answer 2

Resposta:

7.

18----4

9-----x

18x=4.9

18x=36

x=36÷18

x=2

8.

a) (3x-5).(3x+5)

(3x)²-5²

9x²-25

b)$(\frac{x}{3}-y)^{2}$

$(\frac{x}{3} )^{2} -2.\frac{x}{3} .y.y^{2}$

$\frac{x^{2} }{9} -\frac{2xy}{3} +y^{2}$

c)$(\sqrt{7} +\sqrt{3} )^{2}$

$7+2\sqrt{21} +3$

$10+2\sqrt{21}$

d) (3a+1)³

(3a)³+3×(3a)²×1+3×3a×1²+1³

27a³+3×9a²×1+3×3a×1+1

27a³+27a²+9a+1

e) (2x-1)³

(2x)³-3×(2x)²×1+3×2x×1²-1³

8x³-3×4x²×1+3×2x×1-1

8x³-12x²+6x-1

f) (x²+x+6)²

x^4+x²+36+2x³+12x²+12x

x^4+13x²+36+2x³+12x

x^4+2x³+13x²+12x+36

9.

a)$\frac{2}{5-\sqrt{2} }$

$\frac{2}{5-\sqrt{2} } .\frac{5+\sqrt{2} }{5+\sqrt{2} }$

$\frac{2(5+\sqrt{2)} }{(5-\sqrt{2}).(5+\sqrt{2})}$

$\frac{10+2\sqrt{2} }{25-2}$

$\frac{10+2\sqrt{2} }{23}$

b) $\frac{6\sqrt{2} }{\sqrt{3} }$

$\frac{6\sqrt{2} }{\sqrt{3} } .\frac{\sqrt{3} }{\sqrt{3} }$

$\frac{6\sqrt{2} \sqrt{3} }{\sqrt{3} \sqrt{3} }$

$\frac{6\sqrt{6} }{3}$

$2\sqrt{6}$