(-21/10)+21/10.3/4-3/4 (31/10-5/2).(3^2-2)

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1. `(-21)/10 + 21/10 . 3/4 – 3/4`

   `=(-21)/10 + 63/40 – 3/4`

   `= (-84)/40 + 63/40 – 30/40`

   `=(-51)/40`

   `(31/10 – 5/2) .(3^2 -2)`

   `= (31/10 – 25/10) .(9-2)`

   `=3/5 . 7`

   `=21/5`

    

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2. (-21/10) + 21/10 . 3/4 – 3/4

   = -21/10 + 63/40 – 3/4

   = -84/40 + 63/40 – 30/40

   = -51/40

   (31/10-5/2).(3^2 – 2 )

   = 3/5 . 7

   = 21/5

   # chuc hoc tot

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