`n)`

`(2-3x)(x+11)=(3x-2)(2-5x)`

`<=> (2-3x)(x+11)+(2-3x)(2-5x)=0`

`<=> (2-3x)(x+11+2-5x)=0`

`<=> (2-3x)(13-4x)=0`

`<=> x=2/3` hoặc `x=13/4`

`->S={2/3;13/4}`

`o)`

`3/7x-1=1/7x(3x-7)`

`<=> 3/7x-1=3/7x^2-x`

`<=> (3/7x-1)-x(3/7x-1)=0`

`<=> (3/7x-1)(1-x)=0`

`<=> x=7/3` hoặc `x=1`

`->S={7/3;1}`

`p)`

`(x-3/4)^2+(x-3/4)(x-1/2)=0`

`<=> (x-3/4)(x-3/4+x-1/2)=0`

`<=> (x-3/4)(2x-5/4)=0`

`<=> x=3/4` hoặc `x=5/8`

`->S={3/4;5/8}`

`q)`

`1/x+2=(1/x+2)(x^2+1) (x ne 0)`

`<=> (1/x+2)-(1/x+2)(x^2+1)=0`

`<=> (1/x+2)(1-x^2-1)=0`

`<=> -x^2(1/x+2)=0`

`<=> x=0 (text[l])` hoặc `x=-1/2(text[n])`

`->S={-1/2}`

`r)`

`(2x+3)([3x+8]/[2-7x]+1)=(x-5)([3x+8]/[2-7x]+1) ( x ne 2/7)`

`<=> ([3x+8]/[2-7x]+1)(2x+3-x+5)=0`

`<=> ([3x+8]/[2-7x]+1)(x+8)=0`

`<=> [3x+8]/[2-7x]=-1` hoặc `x=-8 (text[n])`

`<=> 3x+8=7x-2` hoặc `x=-8`

`<=> x=5/2(text[n])` hoặc `x=-8`

`->S={5/2;-8}`

ʙʟᴀᴄᴋꜱᴛᴀʀᴠɴツ