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vuhien2019
2 năm trước
1.Tìm x biết: a) $($\frac{4}{5}$)^{2x+7}$ = $\frac{625}{256}$ b) $\frac{$7^{x+2}$ +$7^{x+1}$ $7^{x}$}{57}$ =$\frac{$5^{2x}$ +$5^{2x+1}$ +$5^{2x+3}$}{131}$ 2. a)So Sánh $\frac{1}{$101^{2}$}$ +$\frac{1}{$102^{2}$}$ + $\frac{1}{$103^{2}$}$ +$\frac{1}{$104^{2}$}$ +$\frac{1}{$105^{2}$}$ với $\frac{1}{$2^{2}$.3.$5^{2}$.7}$ b)Chứng minh rằng: $3^{x+1}$ +$3^{x+2}$ +$3^{x+3}$ +...+$3^{x+100}$ chia hết cho 20
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