[ toán 7] cần gấp

D

dien0709

$pt=> 2^x+2^y=2^{5x}.2^y\to 2^x=2^y(2^{5x}-1)$

$\to 2^{x-y}=2^{5x}-1\to 2^{5x}-2^{x-y}=1\to x=y=\dfrac{1}{5}$

Phải L7 ?
 
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