A= 12/13+154/143- (21/23+275/253) * x/y là P/s #miicutehonphmaique

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1. `A = 12/13 + 154/143 – ( 21/23 + 275/253 )`

   `A = 132/143 + 154/143 – ( 231/253 + 275/253 )`

   `A = 286/143 – 506/253`

   `A = 2 – 2`

   `A = 0`

   `#dtkc`

    

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2. `A= 12/13 + 154/143- ( 21/23 + 275/253 )`

   `= 12/13 + 14/13 – 21/23 – 275/253`

   `= (12+14)/13 – 21/23 – 25/23`

   `= 26/13 – (21+25)/23`

   `= 2 – 46/23 = 2 – 2 = 0`

   Vậy `A = 0 `

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