làm hộ mình 2 phép tính. a) x : (-1/2) mũ 3 = -1/2 b) (3/4) mũ 5 . x = (3/4) mũ 7

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1. a) `x:(-1/2)^3=-1/2`

   `↔x=(-1/2).(-1/2)^3`

   `↔x=(-1/2)^4`

   `↔x=1/16`

   b) `(3/4)^5 . x=(3/4)^7`

   `↔x=(3/4)^7:(3/4)^5`

   `↔x=(3/4)^2`

   `↔x=9/16`

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2. Đáp án:

   `a)`

   ` x : (-1/2)^3 = -1/2`

   ` x = -1/2 * (-1/2)^3`

   ` x = (-1/2)^4 = (1/2)^4`

   ` x = 1^4/2^4 = 1/16`

   `b)`

   ` (3/4)^5 * x = (3/4)^7`

   ` x= (3/4)^7 : (3/4)^5`

   ` x= (3/4)^2`

   `  x = 9/16`

    

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