(x 2 + 3x).(x – 4) (x 7 + 3).(x 7 – 3) (1 – t 4 ).(1 + t 4 )

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(x 2 + 3x).(x – 4) (x 7 + 3).(x 7 – 3) (1 – t 4 ).(1 + t 4 )

(xy – 7).(xy + 6) (x 4 + 3x – 4).(x – 2) (c 3 + 4c 2 + c).(c – 1)

(-y 2 + y – 3).(- y + 1) (x 3 – 2x 2 + x + 1).(x – 1) (x + 3).(x + 4) – 2.(x + 1)

3x.(x – 1) + (x + 2).(x + 5) (x + 7).(x – 7) + (x + 2).(x – 1) (3x + 1).(2x – 3) – (6x – 1).(x + 2)

A = x 2 + 3x – 2, B = x + 2, C = x – 3 Determine: A. B A. C A. (B + C)

3x.(2x – 3).(x + 2) - 2x(x + 5).(2x – 5) (x + 1).(x – 2).(x – 3)

(x – 3).(2x – 1).(3x – 2) (a – 2b).(a + 2b).(a – b)

0,2x + 0,5 = 0,3 – 0,3x 1,2x + 0,5 = 0,3x – 0,7 0,7 – 0,1x = – 0,2 + 0,4

Calcular o valor numérico de 2x + 3a para x = 5 e a = -4 Calcular o valor numérico de x² - 7x +y para x = 5 e y = -1 Calcular o valor numérico de : 2 a + m / a + m ( para a = -1 e m = 3)

Calcular o valor numérico de 7 + a – b (para a= 2/3 e b= -1/2 ) 5a² + 3ab (para a = -3 e b = 4) a² + 4a (para a = 2/3) para a = - 1 e m = 0,2 para a = - 3 e b = - 2

Determine a expressão algébrica para o perímetro Determine a expressão algébrica para a área Se x = 3,4, determine o perímetro. Se x = 3,4, determine a área. Determine a expressão algébrica para o perímetro Determine a expressão algébrica para a área Se x = 2/3, determine o perímetro. Se x = 2/3, determine a área. Determine a expressão algébrica para o perímetro Determine a expressão algébrica para a área Se x = 0,2, determine o perímetro. Se x = 1/3, determine a área.

3a + 6b – {4ab – [2a + (3ab – 2b)] – (– 2a + 4b)} –2x 2 – {– 3x 2 – x – [– 4x 2 – 2x + 1 – (3x 2 – 6x – 3)] – (– 2x 2 + x + 1)} – 7x 2 –3x – {– 4x – 3 – [– 6x + 4 – (4x – 6) – (– 4x – 6) – 3x – 2]}