解关于x的方程81^2x÷9^2x÷3^x=81
人气:274 ℃ 时间:2020-02-05 03:28:15
解答
81^2x÷9^2x÷3^x=81
3^8x÷3^4x÷3^x=81
3^(8x-4x-x)=3^4
8x-4x-x=4
x=4/3
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