Question

Answer 1

a) x + -7/15 = -21/20

x = -21/20 - (-7)/15

x = -7/12

vậy x =...

b) (3 1/2 - x) . 1 1/4 = -3/2

(3 1/2 - x) . 5/4 = -3/2

3 1/2 - x = -3/2 : 5/4

3 1/2 - x = -6/5

7/2 - x = -6/5

x = 47/10

vậy x = ..

Answer 2

a) x + -7/15 = -21/20 x = -21/20 - (-7)/15 x = -7/12

b) (3 1/2 - x) . 1 1/4 = -3/2 (3 1/2 - x) . 5/4 = -3/23 1/2 - x = -3/2 : 5/4 3 1/2 - x = -6/5 7/2 - x = -6/5 x = 47/10

 

Answer 3

a) x + -7/15 = -21/20

x = -21/20 - (-7)/15

x = -7/12

 

b) (3 1/2 - x) . 1 1/4 = -3/2

(3 1/2 - x) . 5/4 = -3/2

3 1/2 - x = -3/2 : 5/4

3 1/2 - x = -6/5

7/2 - x = -6/5

x = 47/10