Question

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Answer 1

Resposta:

Explicação passo a passo:

3.

a.

60°+50°+2x=180°

110°+2x=180°

2x=180°-110°

2x=70°

x=70°/2

x=35°

b.

2x+x+3x=180°

6x=180°

x=180°/6

x=30°

4

a.

x+y

1/2+1/3=

3/6+2/6=

5/6

b.

2a+b=

2.-2+5=

-4+5=

+1

5.

a.

x=0,21212121...

100x=21,212121...

100x-x=21,21212121....-0,21212121...

99x=21

x=21/99 [simplifica por 3]

x=7/33

b.

x=2,1424242424242...

10x=21,42424242...

1000x=2142,424242...

1000x-10x=2142,4242...-21,424242...

990x=2121

x=2121/990 [simplifica por 3]

x=707/330