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Apostila: Matemática Básica – por Prof. Emerson F. A. Couto<br />
t) x 1 que representa o semiplano assinalado.<br />
y<br />
1<br />
0 x<br />
u)<br />
<br />
<br />
<br />
2<br />
2<br />
1 2 1 <br />
x y disco aberto de centro 1 2 , 0<br />
<br />
2 <br />
<br />
2 <br />
a e raio 2<br />
1<br />
.<br />
y<br />
1<br />
2<br />
0 1<br />
2<br />
x<br />
114
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