Question

Tìm x biết : 

a) x/7=3/5 

Answer 1

\(\frac{x}{7}=\frac{3}{5}\)

\(\Rightarrow5x=3.7\)

\(\Rightarrow5x=21\)

\(\Rightarrow x=\frac{21}{5}\)

Answer 2

\(\frac{x}{7}\)\(.\)\(\frac{3}{5}\)

=> x.5=3.7

x.5=21

x=21:5

x=\(\frac{21}{5}\)

Answer 3

\(\frac{x}{7}\)\(.\)\(\frac{3}{5}\)

=> x.5=3.7

x.5=21

x=21:5

x=\(\frac{21}{5}\)

Answer 4

x/7 . 3/5

=>x.5=3.7

x.5=21

x=21:5

x=21/5

Answer 5

\(\frac{x}{7}=\frac{3}{5}\Rightarrow x.5=3.7\Rightarrow5x=21\Rightarrow x=\frac{21}{5}\)
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Answer 6

a) \(\frac{x}{7}=\frac{3}{5}\)

    \(\frac{5x}{35}=\frac{21}{35}\)

\(\Rightarrow5x=21\)

        \(x=\frac{21}{5}\)

Vậy \(x=\frac{21}{5}\)

Answer 7

21/5

hok tốt