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答: 1000*1.1的x方=100*1.1的x方 (1000-100)*1.1^x=0 900*1.1^x=0 1.1^x=0 方程無實數解 (1000*1.1)的x方=(100*1.1)的x方 (1000^x)*(1.1^x)=(100^x)*(1.1^x) 因為:1.1^x>0恒成立 所以: 1000^x=100^x 10^(3x)=10^(2x) 3x=2x 解得:x=0
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