Question

Answer 1

a)8(x+4)-3=2(3x-4)

<=>8x+32-3=6x-8

<=>8x+29=6x-8

<=>8x-6x=-8-29

<=>2x=-37

<=>x=-37/2

Vậy....

b)x^2(2x+1)-9(2x+1)=0

<=>(2x+1)(x^2-9)=0

<=>[2x+1=0

       [x^2-9=0

<=>[x=-1/2

      [x=9

Vậy.....

c)3x-2/6-5x/4=x+2/3

<=>12(3x-2)/72-90x/72+24(x+2)/72

<=>36x-24-90x=24x+48

<=>-54x-24=24x+48

<=>-54x-24x=48+24

<=>-78x=72

<=>x=-12/13

d)3x/x+2-3/x-2=3x^2+3/x^2-4

<=>3x(x-2)/(x-2)(x+2)-3(x+2)/(x-2)(x+2)=3x^2/(x-2)(x+2)

<=>3x^2-3x-6=3x^2

<=>-3x-6=0

<=>-3x=6

<=>x=-2

Vậy....

e)|3x-2|=x+1

Nếu 3x-2>=0=>x>=2/3

Thì |3x-2|=3x-2

=>3x-2=x+1

<=>3x-x=1+2

<=>2x=3

<=>x=3/2(thoả mãn x>=2/3)

Nếu 3x-2<0=>x<2/3

Thì |3x-2|=2-3x

=>2-3x=x+1

<=>-3x-1=1-2

<=>-4x=-1

<=>x=1/4(thoả mãn x<2/3)

Vậy....