a)8/75

b)1/1/5

mình thì rồi violympic lớp 7 vòng 3 chứ gì!

tu lam di

Ta có :

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

\(\frac{x}{2^2}+\frac{x}{2^3}+\frac{x}{2^4}-\frac{x}{3^2}-\frac{x}{3^3}-\frac{x}{3^4}=0\)

\(x^2\left(\frac{1}{2^2}+\frac{1}{2^3}+\frac{1}{2^4}-\frac{1}{3^2}-\frac{1}{3^3}-\frac{1}{3^4}\right)=0\)

\(\frac{1}{2^2}+\frac{1}{2^3}+\frac{1}{2^4}-\frac{1}{3^2}-\frac{1}{3^3}-\frac{1}{3^4}\ne0\Rightarrow x^2=0\)

\(x=0\)

\(2\left(\frac{1}{2}\right)^a< \frac{1}{4^{20}}\)

\(\frac{1}{2^{a-1}}< \frac{1}{2^{40}}\)

\(\Rightarrow a-1>40\)

\(Min_a=42\)

Vậy...

Ta có :

\(\frac{2}{7}A=\frac{4}{9}\left(\frac{3}{10}B\right)\)

\(\frac{2}{7}A=\frac{2}{15}B\)

\(\frac{A}{B}=\frac{\frac{2}{15}}{\frac{2}{7}}=\frac{7}{15}\)

Vậy ...

vậy j bạn

a ) \(2x:6=5:3\)

\(\Leftrightarrow\frac{2x}{6}=\frac{5}{3}\)

\(\Leftrightarrow2x=5.6:3\)

\(\Leftrightarrow2x=10\)

\(\Leftrightarrow x=5\)

Các câu còn lại tương tự .

bn ơi mách nốt mik 2 câu còn lại

Ta có :

\(\frac{2}{7}a=\frac{4}{9}\left(\frac{3}{10}b\right)\)

\(\frac{2}{7}a=\frac{2}{15}b\)

\(a=\frac{2}{15}:\frac{2}{7}b\)

\(a.1=\frac{7}{15}b\)

\(\frac{a}{b}=\frac{7}{15}:1=\frac{7}{15}\)

Vậy...