ME AJUDEM NESSES EXERCÍCIOS PFV!
1) calcule o valor numérico das expressões algébricas:
a) 4 + x², para x=3

2) Simplifique os polinômios reduzindo seus semelhantes:
A) 2x - x + 4y + 5x - 2y
B) 5x² + 3x² - 6x + 2x
C) 12a + 5b + 2b - 12a
D) 10a² - ( - a² - 4a + 5 )
E) 5x + ( 7x - 12) - ( 20 + 4x)

3) Calcule
A) 2a.(3a - 7) =
B) ( 2x³)² =
C) 6m ( elevado a 5) : ( -2m² ) =
D) 7x² + 2 ( x² - 1) =
E ) (x + 2)( x + 3) =
F) (c³ + 4c² + c)( c - 1) =
G ) ( x + 3)( x + 4) - 2( x + 1) =
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