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Matemática

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4. (FATEC) simplificando-se a expressão<br />

m.n 0, obtém-se :<br />

a) 0<br />

b) 1<br />

c) 2<br />

d) 3<br />

5(<br />

m n)<br />

e)<br />

3mn<br />

m n<br />

<br />

m n m n<br />

n m<br />

<br />

m n m n<br />

m<br />

1<br />

<br />

n<br />

m<br />

n<br />

1<br />

4mn<br />

<br />

<br />

<br />

n<br />

. 1 <br />

m <br />

, com m R, nR, m n<br />

e<br />

2<br />

5. (PUC-SP) Simplificar a expressão<br />

2<br />

<br />

x<br />

2<br />

2x<br />

<br />

<br />

x<br />

2<br />

1<br />

<br />

<br />

x<br />

2<br />

x<br />

3<br />

x<br />

2<br />

<br />

<br />

<br />

6. (UNIFOR CE/) O número real<br />

3 2 2<br />

3x 3x 6x x 4x 4<br />

y é equivalente a:<br />

2<br />

2<br />

x 4 x 2x<br />

a)<br />

3 2<br />

3x 2x 4<br />

x.(x 2)<br />

b)<br />

3 2<br />

3x 2x 4x 4<br />

x.(x 2)<br />

3x<br />

6x 21<br />

c)<br />

<br />

4<br />

d)<br />

3x<br />

2 2x 2<br />

2.(x 1)<br />

3x<br />

2 2x 4<br />

e) 2x<br />

24

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