Question

Podem me ajudar com essas questões.

1-Calcule as expressões:
a)-12+7-6=

b)-28-13-7=

c)36+14-2=

d)14+28-15=

e)18+27+7=

f)25-30+18=

2-Calcule as abaixo:
a) 12x+6= 4x-5-3

b)20x-12-x= 6x+9

c)14 (x+2) = 6 (x-3)

d)9 (x-5) = 4 (x+6)

e)2 (x-1) = -3 x-4

f)6 (x-2) = 2 (x+4)

3-Resolva as inadequações:
a)7x-3 > x + 7

b)12x+1>4x-3

c)x+2>3x-3

d)4x+6 <-8x+3

e)5 (x-1) > x +3

f)6 (x-2) < x+2

g)9 (x+3) >2 (x+1)

4-Resolva as operações:
a)5_4 + 2_3 - 1_2=

b)6_2 - 3_4 + 6_7=

c)21 - 4_5 - 3=

d)7_4 + 3_8 - 1_2=

e)2_4 - 5_5 + 3=

f)2_8 + 3_4 + 1_2=

Answer 1

1-Calcule as expressões:
a)-12+7-6= -12-6+7 = -18+7 = -11

b)-28-13-7=-48

c)36+14-2=50-2= 48

d)14+28-15=42-15 = 27

e)18+27+7= 52

f)25-30+18=43-30 = 13

2-Calcule as abaixo:
a) 12x+6= 4x-5-3
12x-4x=-5-3-6
8x=-14
x=-14/8

b)20x-12-x= 6x+9
20x-x-6x=9+12
13x=21
x=21/13

c)14 (x+2) = 6 (x-3)
14x+28=6x-18
14x-6x=-18-28
8x=-46
x=-46/8
x= - 23/4

d)9 (x-5) = 4 (x+6)
9x-45=4x+24
9x-4x=24+45
5x=69
x=69/5

e)2 (x-1) = -3 x-4
2x-2=-3x-4
2x+3x=-4+2
5x=-2
x=-2/5

f)6 (x-2) = 2 (x+4)
6x-12=2x+8
6x-2x=8+12
4x=20
x=20/4
x=5

3-Resolva as inadequações:
a)7x-3 > x + 7
7x-x>7+3
6x>10
x>10/6

b)12x+1>4x-3
12x-4x>-3-1
8x>-4
x=-4/8
x=-1/2

c)x+2>3x-3
x-3x>-3-2
-2x>-5 * (-1)
x>5/2
x=2,5

d)4x+6 <-8x+3
4x+8x<3-6
12x<-3
x<-3/12
x<-1/4

e)5 (x-1) > x +3
5x-5>x+3
5x-x>3+5
4x>8
x>8/4
x>2

f)6 (x-2) < x+2
6x-12<x+2
6x-x<2+12
5x<14
x<14/5

g)9 (x+3) >2 (x+1)
9x+27>2x+2
9x-2x>2-27
7x>-25
x>-25/7

4-Resolva as operações:  * NÃO ENTENDI ESTA QUESTÃO
a)5_4 + 2_3 - 1_2=

b)6_2 - 3_4 + 6_7=

c)21 - 4_5 - 3=

d)7_4 + 3_8 - 1_2=

e)2_4 - 5_5 + 3=

f)2_8 + 3_4 + 1_2=