cần gấp lắm ạ mong giúp trong giờ này

Đáp án:

Bài 1

 `a)` `x+1/3=1/2`

`(3x)/3+1/3=1/2`

`(3x+1)/3=1/2`

`6x+2=3`

`6x=1`

`x=1/6`

`b)` `x+2/6=3/4`

`(6x)/6+2/6=3/4`

`(6x+2)/6=3/4`

`24x+8=18`

`24x=10`

`x=5/12`

`c)` `x+2/5=1/2`

`x=1/2-2/5`

`x=1/10`

Bài 2

`x-2/3=1/4`

`(3x)/3-2/3=1/4`

(3x-2)/3=1/4`

`12x-8=3`

`12x=11`

`x=11/12`

`b)` `x-4/5=5/4`

`(5x)/5-4/5=5/4`

`(5x-4)/5=5/4`

`20x-16=25`

`20x=41`

`x=41/20`

`c)` `x-1/6=2/3`

`(6x)/6-1/6=2/3`

`(6x-1)/6=2/3`

`18x-3=12`

`18x=15`

`x=5/6`

Bài 3

`a)` `-x+2/15=3/10`

`-x=3/10-2/15`

`-x=1/6`

`x=-1/6`

`b)` `-x+3/10=1`

`-x=7/10`

`x=-7/10`

`c)` `x=1/5+2/11`

`x=11/55+10/55`

`x=21/55`

`d)` `x/15=3/5-2/3`

`x/15=-1/15`

`x=-1`

`e)` `11/8+13/6=85/x`

`33/24+52/24=85/x`

`85/24=85/x`

`x=24`

`f)` `x=1/3-2/5`

`x=5/15-6/15`

`x=-1/15`

`g)` `x=3/4-1/12`

`x=9/12-1/12`

`x=2/3`

`h)` `x/14=1/7-3/14`

`x/14=-1/14`

`x=-1`

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