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口算不保證對 x的2次方的n次方=9所以x的2n次方=9 原式=1/9·x的6n次方-3x的4n次方 =1/9·x的2n次方的3次方-3·x的2n次方的平方 =1/9×9的3次方-3×9的平方 =81-3×81 =-2×81 =-162
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