Question

42. Calcule mentalmente o valor de X.

43. resolva as equações fracionárias.

Answer 1

42)

a) 30/x =6

x=5.

b) x=-4

e) x= 15

c) x=4

d) x=-1

f) x=7

43 )

a) 2 +1/x = 4/x

2 = 3/x
x=3/2

b) 3/x + 4/5x=1/10

3.5/5x+4/5x = 1/10

15/5x + 4/5x =19/5x=1/10


5x/19=10

x/19=2


x=38


c)
3/2-(x+2)/3x=-11/6x

3/2=(x+2)/3x -11/6x

3/2=(2x+6)/6x -11/6x
3/2=(2x-5)/6x
Divida tudo por 2
Logo
3=(2x-5)/3x
9x=2x-5
7x=-5
x=-5/7