Question

Valendo 100 pontos,agradecimento e melhor resposta.

Answer 1

$a) \ \frac{ab+c}{ab-c}=\frac{3.1+2}{3.1-2}=\frac{5}{1}=5\\ \\ b) \ \frac{a^2-b^2}{c^2}=\frac{4^2-(-2)^2}{2^2}=\frac{16-4}{4}=3\\ \\ c) \ \frac{4x^2}{a}-\frac{2x}{b}=\frac{4.3^2}{5}-\frac{2.3}{7}=\frac{36}{5}-\frac{6}{7}=\frac{222}{35}\\ \\ d) \ \frac{5a^2b^2}{c}=\frac{5(-2)^2.3^2}{4}=\frac{180}{4}=45\\ \\ e) \ \frac{4a-b}{a^2-3b^2}=\frac{4.4-1}{4^2-3.1^2}=\frac{15}{13}\\ \\ f) \ \frac{1}{5}y+4=\frac{1}{5}.2+4=\frac{2}{5}+4=\frac{2}{5}+\frac{20}{5}=\frac{22}{5}$

Answer 2

Resposta:

A)

ab+c/ab-c

Substitua a = 3; b = 1; c = 2.

3•1+2/3•1-2

3+2/3-2

5/1

5

B)

a²+b²/c²

Substitua a = 4; b = - 2; c = 2.

4²+(- 2)²/2²

16+4/4

20/4

5

C)

4x²/a - 2x/b

Substitua x = 3; a = 5; b = 7.

4•3²/5 - 2•3/7

4•9/5 - 6/7

36/5 - 6/7 ⬅ MMC (35)

252-30/35

222/35

D)

5a²b²/c

Substitua a = - 2; b = 3; c = 4.

5•(- 2)²•3²/4

5•2²•3²/2² ⬅ Simplifique dividindo por 2².

5 • 3²

5 • 9

45

E)

4a-b/a²-3b²

Substitua a = 4; b = 1.

4•4-1/4²-3•1²

16-1/16-3•1

15/16-3

14/13

F)

1/5 • y + 4

Substitua y = 2.

1/5 • 2 + 4

2/5 + 4

2+20/5

22/5