( y – 1 + y – 2 + y – 3 ) : 4 = 5 X 67 – 8

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1. Đáp án:

   $\rm (y-1+y-2+y-3):4=5×67-8\\\,\,\,\,\, (3y-6):4=335-8\\\,\,\,\,\, (3y-6):4=327\\\,\,\,\,\, 3y-6=327×4\\\,\,\,\,\, 3y-6=1308\\\,\,\,\,\, 3y=1314\\\,\,\,\,\, y=1314:3\\\,\,\,\,\, y=438\\Vậy\,\,y=438$

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2. Đáp án:

    `( y -1 + y -2 + y-3) : 4 = 5 xx 67 -8`

   `( y – 1+ y -2 +y-3) :4 = 335-8`

   ` ( y – 1+ y -2 +y-3) :4= 327`

   ` y-1 + y-2 + y-3=327 xx 4`

   `( y+y+y) -(1+2+3) =1308`

   ` 3y – 6=1308`

   ` 3y     =1308 + 6`

   ` 3y     =1314`

   ` y     =1314 : 3`

   ` y    =438`

   Vậy `y=438`

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