Tìm x a) -(-6)/12 + x=9/48 b)x - 4/6=5/25 + (-7)/15 c) x-4/5=6/20 + (-7)/3 d)-(-7)/5 + x=4/9

`Huy`

`a) -(-6)/12 + x = 9/48`

`=> 6/12 + x = 3/16`

`=> x = 3/16 - 6/12`

`=> x = 3/16 - 1/2`

`=> x = 3/16 - 8/16`

`=> x = (-5)/16`

`b) x - 4/6 = 5/25 + (-7)/15`

`=> x - 2/3 = 1/5 + (-7)/15 = 3/15 + (-7)/15 = (-4)/15`

`=> x = (-4)/15 + 2/3`

`=> x = (-4)/15 + 10/15`

`=> x=6/15 -2/5`

`c) x - 4/5 = 6/20 + (-7)/3`

`=> x - 4/5 = 18/60 + (-140)/60`

`=> x - 4/5 = (-122)/60=(-61)/30`

`=> x = (-61)/30 + 4/5`

`=> x = (-61)/30 + 24/30`

`=> x=(-37)/30`

`d) -(-7)/5 + x = 4/9`

`=> 7/5 + x = 4/9`

`=> x= 4/9 - 7/5`

`=> x= 20/45 - 63/45`

`=> x=(-43)/45`

Đáp án:

Giải thích các bước giải: