Question

Answer 1

`a)6/(x-7)=(-3)/7` (ĐK: `x\ne7)`

`x-7=6:(-3)/7`

`x-7=-14`

`x=-14+7`

`x=-7(tm)`

Vậy: `...`

`b)(-3)/5-x=1/2`

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

`x=(-6)/10-5/10`

`x=(-11)/10`

Vậy: `...`

`c)x-3/10=7/15*3/14`

`x-3/10=1/10`

`x=3/10+1/10`

`x=4/10`

`x=2/5`

Vậy: `...`

`d)5/14-x=(-17)/36:51/18`

`5/14-x=(-17)/36*18/51`

`5/14-x=-1/6`

`x=5/14+1/6`

`x=11/21`

Vậy: `..`

`d)-3/4x+1/4(x-1)=-12/5`

`-3/4x+1/4x-1/4=-12/5`

`-1/2x-1/4=-12/5`

`1/2x+1/4=12/5`

`1/2x=12/5-1/4`

`1/2x=43/20`

`x=43/20:1/2`

`x=43/10`

Vậy: `..`

`f)(2x-4/9)(3-11x)=0`

`TH1:2x-4/9=0`

`2x=4/9`

`x=4/9:2`

`x=2/9`

`TH2:3-11x=0`

`11x=3`

`x=3/11`

Vậy: `...`

Answer 2

bài 3 làm như thế nào