Question

resolva as equações abaixo com cálculos

Answer 1

44.a) -4x=8
         -x=8/4
         -x=2      x(-1)
          x= -2

b)3x+17=19
3x=19-17
3x=2
x=2/3

c)2x-1=x-10
2x-x= -10+1
x=9

d)4(2x-5)=3-(-2x+1)
8x-20=3+2x-1
8x-2x=3-1+20
6x=2+20
6x=22
x=22/6   (simplificando por 2)
x=11/3

e)x/4+2=x-3/2    M.M.C(2,4)=2*2*2=8
2x+8(2)=4x-4(3)
2x+16=4x-12
2x-4x= -12-16
-2x= -28
-x= -28/2
-x= -14    x(-1)
x=14

f)4/5+x/2=x/3-1    M.M.C(2,3,5)=2*3*5=30
6(4)+15x=10x-30(1)
24+15x=10x-30
15x-10x= -30-24
5x= -54
x= -54/5

g)x+3=2(x-1/2)
x+3=2x-2/2
x-2x= -2/2-3
-x= -1-3
-x= -4      x(-1)
x=4

h)3(x-4)/9-1=x-4-x/6
3x-12/9-1=x-4-x/6

M.M.C(6,9)=2*3*3=18

2(3x-12)-18(1)=18x-3(4-x)
6x-24-18=18x-12+3x
6x-18x-3x= -12+24+18
-12x-3x= 12+18
-15x=30
-x=30/15
-x=2        x(-1)
x= -2