Question

a) \(\frac{2}{7}\)+ x = -0,75

b) -4\(\frac{1}{5}\)- x = 2,25

c) x : 8,5 = -2,2

d) ( \(\frac{2x}{5}\)- 1 ) : (-5) = \(\frac{1}{7}\)

Answer 1

a) 2/7 + x =  -0,75

x= - 3/4 - 2/7

x= 21/28 - 8/28

x = 13/28

Vậy x = 13/28

b) -4 1/5 - x = 2,25

-21/5 - x = 2,25

-x = 2,25 + 21/5

-x = 45/20 + 21/5

-x = 45/20 + 84/20

-x = 84/20

x = -84/20

Vậy x = -84/20

c) x : 8,5 = -2,2

x = -2,2 . 8,5

x = -18,7

Vậy x = -18,7

d) ( 2x/5 - 1 ) : ( -5 ) = 1/7

2x/5 - 1 = 1/7 . ( -5 )

2x/5 - 1 = -5/7

2x/5 = -5/7 + 1

2x/5 = -5/7 + 7/7

2x/5 = 2/7

x = 2/7 : 2/5

x = 2/7 . 5/2

x = 5/7

Vậy x = 5/7

Answer 2

s m ngu z

A x=-0,75-2/7

B x=-21/5-2,25