Question

ATIVIDADE DE MATEMATICA II TRIMESTRE
1º) Resolva as expressões algébrica, observe os exemplos:
X - 10 = 8 X = 8 + 10 X = 18
a) X – 4 = 15 b) B + 6 = 5 c) C + 9 = - 1 d) M + 10 = 14 2º) Resolva as expressões algébrica, observe os exemplos:
3x – 5 = - x + 15 3X + X = 15 + 5 4X = 20 x = 20/4 x = 5
a) 6y = 2y + 16 c) 2M + 3 = M + 1
b) 5x + 7 = 4x + 10 d) 4a – 10 = 2a + 2
3º) Resolva as expressões algébrica, observe os exemplos:
4 ( A + 3 ) = - 4 4A + 12 = - 4 4A = - 4 – 12 4A = - 16 A = - 16/4 A = - 4
a) 6 ( B – 3 ) = 6 c) 5 ( X – 4 ) = 10
b) 3 ( M – 4 ) = 3 d) 2 ( y + 3 ) = 16

Answer 1

Resposta:

a) X = 15 + 4

X = 19

b). B + 6 = 5

B = 5 - 6

B = -1

c) C + 9 = -1

C = - 1 - 9

C = 8

d) M + 10 = 14

M = 14 -10

M = 4

2) a) 6y + 2y = 16

6−2=2+16−2

4=16

4/4=16/4

= 4

b) 5x + 7 = 4x + 10

5+7−7 = 4 + 10−7

5 = 4 + 3

5 − 4 = 4 +3− 4

= 3

c). 2M + 3 = M + 1

2 = − 2

2 − = −2 −

= −2

d). 4 − 10 = 2 + 2

4a-10 = 2a + 2a − 10 = 2a + 2

4 − 10 + 10 = 2 + 2 + 10

4 = 2 + 12

4 − 2 = 2 + 12 − 2

2 = 12

2/2 = 12/2

a = 6

3) a) 6( −3 )= 6

6 − 18 = 6

6 − 18 +18 = 6 + 18

6 = 24

6/6 = 24/6

= 4

b) 3 ( M – 4 ) = 3

3m - 12 = 3

3m - 12 +12 = 3 + 12

3m= 15

3m/3 = 15/3

m = 5

c). 5 (−4) = 10

5 −20 = 10

5 − 20 + 20 = 10 + 20

5 = 30

5/5 = 30/5

= 6

d) 2 ( y + 3 ) = 16

2y + 6 = 16

2y = 16 - 6

2y = 10

y = 10/2

y = 5

Espero ter ajudado, bons estudos!