tìm x a) x – 5/6 = 11/13 b) 15/16 – x = 1/12 + 2/5 c) 7/8 + 8/9 = x – 1/2 d) 13/12 – 5/7 = x – 6/7 e) x – 1/2 = 16/7 – x

0 bình luận về “tìm x a) x – 5/6 = 11/13 b) 15/16 – x = 1/12 + 2/5 c) 7/8 + 8/9 = x – 1/2 d) 13/12 – 5/7 = x – 6/7 e) x – 1/2 = 16/7 – x”

1. a, `x -5/6=11/13`

   `=> x = 11/13+5/6`

   `=> x = 66/78+65/78`

   `=> x = 131/78`

   b) `15/16 – x = 1/12 + 2/5`

   `=> 15/16-x = 5/60+24/60=29/60`

   `=> x=15/16-29/60`

   `=> x=225/240 – 116/240`

   `=> x = 109/240`

   c)`  7/8 + 8/9 = x – 1/2`

   `=> x-1/2 = 63/72+64/72`

   `=> x-1/2=127/72`

   `=> x=127/72+36/72`

   `=> x=163/72`

   d) `13/12 – 5/7 = x – 6/7`

   `=> x = 13/12-5/7+6/7`

   `=> x=13/12+1/7`

   `=> x=91/84+12/84`

   `=> x=103/84`

   e, `  x – 1/2 = 16/7 – x `

   `=> 2x=16/7+1/2`

   `=> 2x= 32/14+7/14`

   `=> 2x=39/14`

   `=> x=39/28`

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2. `a)`

   ` x -5/6 = 11/13`

   ` => x = 11/13 + 5/6`

   ` => x =131/78`

   `b)`

   ` 15/16 – x = 1/12 + 2/5`

   ` 15/16 – x = 29/60`

   ` x = 15/16 – 29/60`

   ` x = 109/240`

   `c)`

   ` 7/8 + 8/9 = x -1/2`

   ` 127/72 = x – 1/2`

   ` x = 127/72 + 1/2`

   ` x = 163/72`

   `d)`

   ` 13/12 – 5/7 = x – 6/7`

   ` 31/84 = x – 6/7`

   ` x  = 31/84 + 6/7`

   ` x= 103/84`

   `e)`

   ` x -1/2 = 16/7 – x`

   ` x – 1/2 -16/7 + x = 0`

   ` 2x – 39/14 = 0`

   ` 2x = 39/14`

   ` x=  39/28`

    

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