Question

Tìm x,biết :

a)4/7× x - 2/3=1/5

b)7/9-7/8× x =1/3

c)4/5+5/7: x=1

d)2/3×(1/4+3/4 : x)=5/6

Answer 1

a) 4/7 x X = 1/5 + 2/3 

=> 4/7 x X =  3/15  + 10/15 

=> 4/7 x X = 13/15

=> X = 13/15 : 4/7 

=> X = 13/15 x 4/7 = 52/105

Answer 2

a ) 4 / 7 x X = 1 / 5 + 2 / 3

= > 4 / 7 x X = 3 / 1 5 + 1 0 / 1 5

= > 4 / 7 x X = 1 3 / 1 5

= > X = 1 3 / 1 5 : 4 / 7

= > X = 1 3 / 1 5 x 4 / 7

= 5 2 / 1 0 5 

Answer 3

nhầm kết luận là x= 13/15 : 4/7 => x=13/15 x 7/4 => x= 91/60

Answer 4

a, 91/60

b, 32/63

c, 25/7

d, 3/4