[Toán 12] Phương trình logarit

D

dien0709

$ log_2x + log_3x + log_4x = log_{40} x $

pt=>$log_2x+log_32.log_2x+\dfrac{1}{2}log_2x-log_402.log_2x=0$

=>$log_2x(1+1/2+log_32-log_402)=0$=>$log_2x=0$=>$x=1$
 
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