Question

por favor responder essa questão ​

Answer 1

Resposta:

a)

$\frac{n(n + 1) }{2}$

n=1

1(1+1)/2

1*2/2

2/2

1

n=2

2(2+1)/2

2*3/2

6/2

3

n= -1

1(-1+1)/2

1*0/2

0/2

0

n= -2

-2(-2+1)/2

-2*(-1)/2

2/2

1

n=1/2

1/2(1/2+1)/2

1/2(3/2)/2

(3/4)/2

3/4 * 1/2

3/8

b)

4n - 1

n=1

4(1) - 1 = 4-1 = 3

n=2

4(2) - 1 = 8-1 = 7

n=-1

4(-1) - 1 = -4-1 = -5

n=-2

4(-2) - 1 = -8-1 = -9

c)

6n/2 = 3n

3(1) = 3

3(2) = 6

3(-1) = -3

3(-2) = -6

3(1/2) = 3/2

d)

1² = 1

2²= 4

(-1)² = 1

(-2)² = 4

(1/2)² = 1/4

e)

4² = 16

Some as respostas de d) a 16

17

20

16

20

65/4

f)

n²+(n+1)²

1 + 2² = 5

4+(3)²= 13

1 +(0)²= 1

4 + (-1)² = 5

1/4 +(5/4)²= 1/4 + 25/16 = (4+25)/16 = 29/16

Espero ter ajudado!!♡