Lần đầu e thấy đề này đấy cj .
\(\sqrt[4]{3}.243^{\frac{2x+3}{x+8}}=3^{-2}.9^{\frac{x-8}{x+2}}\)
\(\sqrt[4]{3}.243^{\frac{2x+3}{x+8}}=\frac{1}{9}.9^{\frac{x+8}{x+2}}\)
\(\sqrt[4]{3}.243^{\frac{2x-3}{x+8}}=9^{\frac{x+8}{x+2}}-1\)
\(\sqrt[4]{3}.3^5^{\frac{2x-3}{x+8}}=3^2^{\left(\frac{x+8}{x+2}-1\right)}\)
\(\frac{1}{4}+\frac{5\left(2x+3\right)}{x+8}=2\left(\frac{x+8}{x+2}-1\right)\)
\(\frac{x+8}{4x+32}+\frac{20\left(2x+3\right)}{4x+32}=2\left(\frac{x+8}{x+2}-1\right)\)
Dễ rồi cj lm nốt nhé !
ĐK: \(x\ne-8;-2\)
\(\sqrt[4]{3}.243^{\frac{2x+3}{x+8}}=3^{-2}.9^{\frac{x+8}{x+2}}\)
<=> \(3^{\frac{1}{4}}.3^{5.\frac{2x+3}{x+8}}=3^{-2}.\left(3\right)^{2.\frac{x+8}{x+2}}\)
<=> \(3^{\frac{1}{4}+5.\frac{2x+3}{x+8}}=\left(3\right)^{-2+2.\frac{x+8}{x+2}}\)
<=> \(\frac{1}{4}+5.\frac{2x+3}{x+8}=-2+2.\frac{x+8}{x+2}\)
<=> \(\frac{10x+15}{x+8}-\frac{2x+16}{x+2}+\frac{9}{4}=0\)
<=>4 ( 10x + 15 ) ( x + 2 ) -4 ( 2x + 16 ) ( x + 8 ) + 9 ( x + 8 ) ( x + 2 ) = 0
<=> 41 x^2 +102x - 248 = 0 ( giải đenta)
<=> x = -4 hoặc x = 62/41 ( thỏa mãn )
Vậy ...
