2/3 × X = -21/27 -1và3/5 × X =1 và 1/15 1/3 + 1/2 ÷ X =-4 3/4+1/4 ÷X = 2/5

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1. Giải thích các bước giải:

   `2/3 .x = -21/27`
   `=>x=-21/27:2/3`
   `=>x=-21/27 . 3/2`
   `=>x=-63/54`
   `=>x=-7/6`
   `-1 3/5 . x =1  1/15`
   `=>-8/5 . x=16/15`
   `=>x=16/15 : (-8)/5`
   `=>x=16/15 . (-5)/8`
   `=>x=-80/120`
   `=>x=-2/3`
   `1/3 + 1/2 😡 =-4`
   `=>1/2:x=1/3-(-4)`
   `=>1/2:x=1/3+4`
   `=>1/2:x=1/3+12/3`
   `=>1/2:x=13/3`
   `=>x=1/2:13/3`
   `=>x=1/2. 3/13`
   `=>x=3/26`
   `3/4+1/4 😡 = 2/5`
   `=>1/4:x=2/5-3/4`
   `=>1/4:x=8/20-15/20`
   `=>1/4:x=-7/20`
   `=>x=1/4:(-7)/20`
   `=>x=1/4 . (-20)/7`
   `=>x=-20/28`
   `=>x=-10/14`
   `=>x=-5/7`

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2. a)

   `2/3 × x=-21/27`

   `→-21/27 : 2/3 = x`

   `→x=-7/6`

   b)

   `-1 3/5×x=1 1/5`

   `→-8/5×x=6/5`

   `→x=6/5:(-8/5)`

   `→x=-3/4`

   c)

   `1/3+1/2:x=-4`

   `→1/2:x=-4-1/3`

   `→1/2:x=-13/3`

   `→x=1/2:(-13/3)`

   `→x=-3/26`

   d)

   `3/4+1/4:x=2/5`

   `→1/4:x=2/5-3/4`

   `→1/4:x=-7/20`

   `→x=1/4:(-7/20)`

   `→x=-5/7`

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