\(=3-1+\frac{1}{2^2.2}\)

\(=2+\frac{1}{8}=\frac{17}{8}\)

= 17 / 8

k cho mk nha

ai k mk mk k lai

k mình nha

\(\left(\frac{3}{7}\right)^{21}:\left(\frac{9}{49}\right)^6\)\(=\left(\frac{3}{7}\right)^{21}:\left(\frac{3}{7}\right)^{2^6}\)\(=\left(\frac{3}{7}\right)^{21}:\left(\frac{3}{7}\right)^{12}\)

                                  \(=\left(\frac{3}{7}\right)^{21-12}\)\(=\left(\frac{3}{7}\right)^9\)

\(\left(\frac{3}{7}\right)^{21}:\left(\frac{9}{49}\right)^6\)

\(=\left(\frac{3}{7}\right)^9.\left(\frac{3}{7}\right)^{12}:\left[\left(\frac{3}{7}\right)^2\right]^6\)

\(=\left(\frac{3}{7}\right)^9.\left(\frac{3}{7}\right)^{12}:\left(\frac{3}{7}\right)^{12}\)

\(=\left(\frac{3}{7}\right)^9=\frac{3^9}{7^9}=\frac{19683}{40353607}\)

\(\left(\frac{3}{5}\right)^{2003}:\left(\frac{9}{25}\right)^{1000}\)

\(=\left(\frac{3}{5}\right)^{2003}:\left(\left(\frac{3}{5}\right)^2\right)^{1000}\)

\(=\left(\frac{3}{5}\right)^{2003}:\left(\frac{3}{5}\right)^{2000}\)

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

\(=\frac{27}{125}\)

\(\left(\frac{3}{5}\right)^{2003}:\left(\frac{9}{25}\right)^{1000}\)

\(=\frac{3}{5}.\left[\left(\frac{3}{5}\right)^2\right]^{1000}:\left(\frac{9}{25}\right)^{1000}\)

\(=\frac{3}{5}.\left(\frac{9}{25}\right)^{1000}:\left(\frac{9}{25}\right)^{1000}\)

\(=\frac{3}{5}\)

\(25^3:5^2=\left(5\right)^{2^3}:5^2=5^6:5^2\)\(=5^{6-2}=5^4=625\)

nha

\(25^3:5^2=\left(5^2\right)^3:5^2=5^6:5^2=5^4\)

t ick cho mik nha

gọi a,b,c là 3 cạnh của tam giác

suy ra a/3=b/4=c/5= a+b+c/ 3+4+5=60/12=5

a/3=5 suy ra a=15

b/4=5 suy ra b=20

c/5=5 suy ra c=15

chữ suy ra của mik bạn nên thay bằng dấu suy ra nhak

Cạnh thứ nhất là: 60:(3+4+5)*3= 15(cm)

Cạnh thứ 2 là:60:(3+4+5)*4=20(cm)

Cạnh thứ 3 là: 60-15-20=25(cm)

Đ/s:15cm

      20cm

      30cm