2, 7 × X + 8,2 × X + X = 60 (X-1/2) ×5/3 =7/4 -1/2

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1. 2x-2/6 + 3x+6/6=0,25

   5x+4=1,5

   5x=-2,5

   x=-0,5

   7)x-1=60-x+1

   2x=62

   x=31

   8)(x+1/5)^2=9/25

   x+1/5=3/5    hoac x+1/5=-3/5

   x=2/5   hoac x=-4/5

   9)x:3/7=-5/7

   x=-15/49

   10)7/9 : 5/4x=8/27              

   28x/45=8/27               (chia nghich dao)

   28x=40/3

   x=10/21

   11)x+1/2=0      hoac 2/3-2x=0

   suy ra:x=-1/2     hoac 2x=2/3

   suy ra:x=-1/2    hoac x=1/3

   12) (3x-7/9)^3=-8

   3x-7/9=-2

   3x=-11/9

   x=-11/27.

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2. Đáp án:

   `2,7 × x + 8,2 × x + x = 60`
   `2,7 × x + 8,2 × x + x × 1 = 60`

   `(2,7 + 8,2 + 1) × x = 60`

   `11,9 × x = 60`

   `x = 60 : 11,9`

   `x= 600/119`

   `(x-1/2) ×5/3 =7/4 -1/2`

   `(x-1/2) ×5/3 =5/4`

   `x – 1/2 = 5/4 : 5/3`

   `x – 1/2 = 3/4`

   `x = 3/4 + 1/2`

   `x = 5/4`

    

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