
1 ANO REC - 2 TRI
Mathematics
1st Grade
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8 questions
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1.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Qual das equações lineares abaixo tem como solução a terna (1, 2, –5)?
2x – 3y – z = 1
4x – y + z = 0
x + y – z = –2
x + y + z = 8
2.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Numa loja, todas as calças têm o mesmo preço, e as camisas também, sendo o preço de uma calça diferente do de uma camisa. Ricardo comprou 1 calça e 2 camisas e pagou R$ 240,00. Roberto comprou 2 calças e 3 camisas e pagou R$ 405,00. Qual o preço, em reais, de uma calça e uma camisa, respectivamente?
85 e 80.
75 e 90.
80 e 85.
90 e 75
3.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Se a mãe de Murilo triplicar o valor pago de sua mesada e descontar 5 reais, ele ficará com R$ 40,00.
Uma equação que expressa essa situação é:
3x + 5 = 40
3x + 35 = 0
3x – 5 = 40
3x + 35 = 0
4.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
Determine o valor de x , y que é solução do sistema:
x = 3
y = 9
x = -9
y = 3
x = 12
y = - 3
x = 12
y = 3
5.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Analisando o gráfico ao lado, posso afirmar que a solução do sistema s = { x, y } é:
s = { -2, -1 }
s = { -1, -2 }
s = { -4, -2 }
s = { -2, -4 }
6.
FILL IN THE BLANK QUESTION
15 mins • 2 pts
Determine, por escalonamento os valores de x, y, z:
7.
MULTIPLE CHOICE QUESTION
10 mins • 1 pt
O gráfico ao lado representa as retas 1 e 2, e a solução do sistema. Quais equações representam os sistema:
2x + y = 1
- x + y = -5
2x + y = 1
x + y = -5
2x + y = 1
- x - y = -5
- 2x + y = 1
- x + y = -5
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