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数学
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已知 2^2n+1+4^n=48 求n的值(^此符号解释为n次方)
人气:316 ℃ 时间:2020-03-29 23:40:47
解答
2^(2n+1)+4^n=48
2×2^(2n)+(2^2)^n=48
2×2^(2n)+(2^2n)=48
3×2^(2n)=48
3×2^(2n)=3×2^4
2n=4
n=2 //:这是答案.对比底数和指数:由:3×2^(2n)=3×2^42^(2n)=2^4 2n=4 n=2
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