\(27=\frac{x^7}{81}\)
\(x^7=2187\)
\(x^7=3^7\)
\(\Rightarrow x=3\)
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\(\frac{x^7}{81}=27\)
\(A=\frac{\frac{1}{11}-\frac{1}{13}-\frac{1}{17}}{\frac{5}{11}-\frac{5}{13}-\frac{5}{17}}+\frac{\frac{-3}{3}-\frac{2}{9}-\frac{2}{27}+\frac{2}{81}}{\frac{7}{3}-\frac{7}{9}-\frac{7}{27}+\frac{7}{81}}\)
\(27=\frac{x^7}{81}\)
\(27=\frac{x^7}{81}\)
Tìm x,biết:
a) \(\frac{x^7}{81}\) = 27
b) \(\frac{x^8}{9}\) 729
Tìm x biết
a) \(\left(\frac{3}{5}\right)^5.x=\left(\frac{3}{7}\right)^7\)
b) \(\left(-\frac{1}{3}\right)^3.x=\frac{1}{81}\)
c) \(\left(x-\frac{1}{2}\right)^3=\frac{1}{27}\)
d) \(\left(x+\frac{1}{4}\right)^4=\frac{16}{81}\)
Ai xong nhanh nhất cho 1 like \(☺\)
Bài 1: Tính: A= \(\frac{81^{10}.3^{17}}{27^{10}.9^{13}}\)
Bài 2: Tìm x, y: \(\frac{x}{7}=-\frac{12}{49}\)
\(\frac{9}{27^x}=\frac{3^{x+2}}{81}\)
x^7/81=27