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8ano monomios polinomios_casos_notaveis
8ano monomios polinomios_casos_notaveis
silvia_lfr
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Mar 14, 2015
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Mar 14, 2015
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Slide 1
Ficha de Avaliação - Matemática 8º Ano
Nome:__________________________________________ Nº:______ Turma: ____
Classificação: ___________________ Prof:_____________ Enc. Educ.:___________
Nota: Apresenta todos os cálculos que efectuares
1. Completa o seguinte quadro:
Monómio Coeficiente Parte literal Grau
2x
3
-3xy
2
3
-2 x
2
yz
6y
2. Efectua as seguintes operações e apresenta o resultado na forma mais simples por
redução dos termos semelhantes.
2.1 2x - (3 - x) = 2.2 -3x
2
- x + 4 + 2x + x
2
=
2.3 5x × 3x = 2.4 -2x × 3x
3
=
2.5 5y × x = 2.6 -3y
3
× 2xy =
2.7 xy × 2x
2
y
3
= 2.8 (x + 2) (x + 5) =
2.9 (2x + 1) (3 - x) + x(x + 2) =
(continua...)
2 x
2
y
3
1
2
Slide 2
3. Resolve as seguintes equações:
3.1 2 (x - 3) + 7 = 5 3.2 + = 4
4. Resolve a seguinte equação literal em ordem a x :
3x - 2y = 5
5. Para cada uma das seguintes questões, indica a resposta correcta:
5.1
(x + 4)
2
=
5.2
(25 - y
2
) =
(continua...)
2x - 2
3
1 - 3x
2
x
2
+ 4
2
x
2
- 8x + 16
x
2
+ 8x + 16
(5 - y) (5 + y)
(5 - y)
2
(25 - y) (25 + y)
Slide 3
5.3
(-x + 4)
2
=
6. Simplifica as expressões, usando os casos notáveis da multiplicação:
6.1 (2x - 3)
2
= 6.2 (3x - 2) (3x + 2) =
7. Completa as seguintes igualdades:
7.1 a
2
- 12a + 36 = (a
2
- .....) 7.2 (x - )
2
= ..... - x + .....
7.3 9 - 4x
2
= (..... + .....) (..... - .....) 7.4 25y
2
+ 20y + ..... = (..... + 2 )
2
7.5 b
4
- 36 = (..... - 6) ( ..... + 6)
Bom Trabalho
O Professor
______________
(Ricardo Pinto)
(-x)
2
+ 4
2
-x
2
+ 8x + 16
x
2
- 8x + 16
1
2
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