Question

Tìm n

a.    n² =  1 / 16

b.   n³  x  n²  = 32 /243

c.   (x²)²  = 81 / 16 

Answer 1

\(a,n^2=\frac{1}{16}\)

\(n^2=\left(\frac{1}{4}\right)^2\)

\(n=\left|\frac{1}{4}\right|\)

=>\(n=\frac{1}{4}\)hoặc \(n=-\frac{1}{4}\)

\(b,n^3.n^2=\frac{32}{243}\)

\(n^5=\frac{32}{243}\)

\(n^5=\left(\frac{2}{3}\right)^5\)

\(n=\frac{2}{3}\)

\(c,\left(x^2\right)^2=\frac{81}{16}\)

\(x^4=\left(\frac{3}{2}\right)^4\)

=>\(x=\left|\frac{3}{2}\right|\)

\(x=\frac{3}{2}\)hoặc \(x=-\frac{3}{2}\)