Tìn x biết a,-7/x=-21/x-34 b,x+1/3=2/6 c,4-x/-5=-5/4-x c,3/x+2=5/2x+1 d,1/2=x+1/3x e,-3/x+1=4/2-2x

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1. Đáp án:

    a)-7/x+21/x=34

   ⇔14/x=34

   ⇔x=7/17

   b)x=2/6-1/3

   ⇔x=2/6-2/6=0

   c)(4-x/-5)(-5/4-x)=0

   ⇔(4-x)².25/-5.(4-x)=0

   ⇔(4-x).-5=0

   ⇔4-X=0

   ⇔X=4

   d) -x=-1/2+1/3

   ⇔-x=-3/6+2/6

   ⇔-x=-1/6

   ⇔x=1/6

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

   ⇔-3/x+2x=2-1

   ⇔-3/x+2x=1

   ⇔-3+2x²/x-1=0

   ⇔-3+2x²-x=0

   Giải thích các bước giải:

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