Question

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Answer 1

a. x+15+3x-5=90

4x=90-15+5

4x=80

x=20

b. 3x+20+x=180

4x=180-20

x=160/4

x=40

c. 2x+25+4x+x-5=90

7x=90-25+5

7x=70

x=10

d. x+27+x/3+x+x/2=180

x+x/3+x+x/2=180-27

3x/3+x/3+2x/2+x/2=153

4x/3+3x/2 = 153

(8x+9x)/6=153

17x/6=153

x=153/(17/6)

x = 54

Answer 2

Explicação passo a passo:

a)

soma = 90°

x + 15 + 3x - 5 = 90

4x = 90 - 10 = 80

x = 80/4 = 20°

b)

soma = 180°

3x + 20 + x = 180

4x = 180 - 20 = 160

x = 160/4 = 40°

c)

soma = 90°

2x + 25 + 4x + x - 5 = 90

7x = 90 - 20 = 70

x = 70/7 = 10°

d)

soma = 180°

x + 27 + x/3 + x + x/2 = 180

mmc(2,3)  = 6

6x + 162 + 2x + 6x + 3x = 1080

17x = 1080 - 162 = 918

x = 918/17 = 54°