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答: 1000*1.08的x方=100*1.1的x方 10*1.08^x=1.1^x (1.1/1.08)^x=10 兩邊取對數: x lg(1.1/1.08)=1 所以:x=1/lg(1.1/1.08)=1/0.00796893=125.4873667 所以:x≈125.4873667
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