Question

[vũ thị phương nga]

 tìm x bt a) 1/2-(3/4-5/6)=1-x  b)1/4-x=1/3-1/5  c)5/3-3/4+x=7/12    d)1/4-(1/3-x+5/12)=3-(7/0-1/2   giúp mình nhé 

Answer 1

[Ngọc Mai]

a) 1/2 - (3/4 - 5/6)

<=> 1/2 - (3/4 - 5/6) + x = 1 - x + x

<=> x + 7/12 = 1

<=> x = 1 - 7/12

<=> x = 5/12

=> x = 5/12

Answer 2

[Ngọc Mai]

b) 1/4 - x = 1/3 - 1/5

<=> 1/4 - x = 5/15 - 3/15

<=> 1/4 - x = 2/15

<=> x = 2/15 - 1/4

<=> x = 7/60

=> x = 7/60