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3 -4 * 2 +10 * 3 = 21 = 7 * 3 3的4次方-4 * 3 +10 * 2 = 63 = 7 * 3 2 5日-4 * 3 ^ 4 +10 * 3 = 189 = 7 * 3 … 3 ^(N +2)-4 * 3 ^(N +1)+10 * 3 ^ N = 7 * 3的n次方 有疑問,請諮詢滿意,
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