化简 9^x-9(3^{x+2})+243

解答

化简

9^{x} - 9 (3^{x + 2}) + 243

9^{x} - 3^{x + 4} + 243

求解步骤

9^{x} - 9 (3^{x + 2}) + 243

使用法则:

(a) = a

(3^{x + 2}) = 3^{x + 2}

= 9^{x} - 9 \cdot 3^{x + 2} + 243

化简

9 \cdot 3^{x + 2} : 3^{x + 4}

= 9^{x} - 3^{x + 4} + 243

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