Matemática 5 - Centro Universitário Internacional PDF

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Centro Universitário Internacional...

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Centro Universitário Internacional 1- (+ 100). (-30 ) = 2-( + 14). (+ 20 ) = 3-(-90). ( + 30 ) = 4-( - 125).( + 60 ) = 5-(-125).(+60)=

1-(-18):(-6)= 2-(-20):(+5)= 3-(-40):(+8)= 4-(-120):(-30)= 5-(+66):(+6)= 7-(-90):(-30)=

Resposta: 1-(+ 100). (-30 ) =-3000

2-( + 14). (+ 20 ) =+280

3-(-90). ( + 30 ) =-2700

4-( - 125).( + 60 ) =-7500

5-(-125).(+60)=-7500

1-(-18):(-6)=+3

2-(-20):(+5)=-4

3-(-40):(+8)=-5

4-(-120):(-30)=+4

5-(+66):(+6)=+11

7-(-90):(-30)=+3

2- Resolva as equações: a) 360 + 36x = 30x b) 2x + 5 − 5x = −1 c) 5 + 6x = 5x + 2 d) x + 2x − 1 − 3 = x e) −3x + 10 = 2x + 8 + 1 f) 5x − 5 + x = 9 + x g) 7x − 4 − x = −2x + 8 − 3x h) – x − 5 + 4x = −7x + 6x + 15

resposta: a) 360 + 36x = 30x

b) 2x + 5 − 5x = −1

36x-30x=-360

-3x+5=-1

6x=-360

-3x=-1-5

x=-360/6

-3x=-6(-1)

x=-60

3x=6

x=6/3

c) 5 + 6x = 5x + 2

6x-5x=2-5

x=-3

x=2

d) x + 2x − 1 − 3 = x

e) −3x + 10 = 2x + 8 + 1 f) 5x − 5 + x = 9 + x

3x-4=x

-3x+10=2x+9

6x-5=9+x

3x-x=4

-3x-2x=9-10

6x-x=9+5

2x=4

-x=-1(-1)

x=4/2

x=1

5x=14

x=14/5

x=2

g) 7x − 4 − x = −2x + 8 − 3x

h) – x − 5 + 4x = −7x + 6x + 15

6x-4=-5x+8

3x-5=-x+15

6x+5x=8+4

3x+x=15+5

11x=12

4x=20

x=12/11

x=20/4

x=5

3- Efetue: A) (+5) x (+3)=

B) (+4) x (-5)=

C) (-8) x (+4)=

D) (-6) x (-7)=

E) (-2) x (+4) x (+3) x (-1)=

Resposta: A) (+5) x (+3)=+15

B) (+4) x (-5)=-20

C) (-8) x (+4)=-32

D) (-6) x (-7)=+42

E) (-2) x (+4) x (+3) x (-1)=+24

4- Calcule as porcentagens: a) 15% de R$ 400 b) 7% de R$ 200000 c) 42% de R$ 150

d) 2% de R$ 56,25 e) 4,5% de 36

resposta: a)400.15/100

b)200000.7/100

4.15

2000.7

R$60,00

R$14000,00

d)56,25.2/100

e)36.4,5/100

c)150.42/100

6300/100

R$63,00

112,50/100

R$1,125

162/100

R$1,62...