Question

mn giúp em với ạ .

Answer 1

a) Ta có: \(\dfrac{x}{27}=\dfrac{-2}{3.6}\)

nên \(x=\dfrac{-2\cdot27}{3.6}=\dfrac{-54}{3.6}=-15\)

b) Ta có: \(-0.52:x=-9.36:16.38\)

\(\Leftrightarrow x=\dfrac{-0.52}{-9.36:16.38}\)

\(\Leftrightarrow x=\dfrac{0.52}{9.36:16.38}\)

\(\Leftrightarrow x=\dfrac{91}{100}\)

c) Ta có: \(\dfrac{x}{-15}=\dfrac{-60}{x}\)

\(\Leftrightarrow x^2=900\)

hay \(x\in\left\{30;-30\right\}\)

d) Ta có: \(0,25\cdot x:3=0,125\)

\(\Leftrightarrow0,25\cdot x=0,375\)

hay x=1,5