\(\dfrac{x}{120}=\dfrac{30}{48}\)

\(\Rightarrow x\times48=30\times120\)

\(\Rightarrow x\times48=3600\)

\(\Rightarrow x=3600\div48\)

\(\Rightarrow x=75\)

\(---------------\)

\(\dfrac{25}{35}=\dfrac{15}{x}\)

\(\Rightarrow x\times25=15\times35\)

\(\Rightarrow x\times25=525\)

\(\Rightarrow x=525\div25\)

\(\Rightarrow x=21\)

sang hoidap chs ko Hobiee:)

mấy ngày nay sang hoidap cày nhiều h nghiện luôn:)

xem lại ạ

\(\dfrac{8}{15}-x:\dfrac{3}{4}=\dfrac{11}{18}\)

\(\Rightarrow x:\dfrac{3}{4}=\dfrac{8}{15}-\dfrac{11}{18}\)

\(\Rightarrow x:\dfrac{3}{4}=\dfrac{144}{270}-\dfrac{165}{270}\)

\(\Rightarrow x:\dfrac{3}{4}=\dfrac{-7}{90}\)

\(\Rightarrow x=\dfrac{-7}{90}\times\dfrac{3}{4}\)

\(\Rightarrow x=\dfrac{-7}{120}\)