Tìm x, biết A) x – 1/3 + 3x – 5/2 + 2x/9 + – 5x + 3 /9 =210/240 B) |2x – 1/3| = 1/2 C) | x – 2/5| – 1/3 = 1/2

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1. A) x-1/3+3x-5/2+2x/9-5x+3/9=210/240

   =) (x+3x-5x)+(-1/3+2x/9+3/9)-5/2=7/8

   =) -x+(-3+2x+3)-5/2=7/8

   =) -x+2x=27/8

   =) x=9/8

   B)|2x-1/3|=1/2

   =) |2x|=5/6

   =) |x|=5/12

   =) x=-5/12

   C) |x-2/5| -1/3=1/2

   =) |x-2/5|=-5/6

   =) |x|=37/30

   =) x=-37/30

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