\(\dfrac{x}{5}=\dfrac{y}{6}và x+y=33\)
Ta có \(\dfrac{x}{5}=\dfrac{y}{6}=\dfrac{x+y}{5+6}=\dfrac{33}{11}=3\)
⇒\(\dfrac{x}{5}=3\Rightarrow x=3.5=15\)
   \(\dfrac{y}{6}=3\Rightarrow y=3.6=18\)
Vậy x=15; y=18

3 phút 4 giây...>..47 giây                  3 tạ 11 kg...>...30 yến 10kg

1 thế kỉ 23 năm...=...123 năm         4 km 85 dm...>...4582m

\(126-\left[4^2-5^2\right]+870:29\\ =126-\left[16-25\right]+870:29\\ =126-\left(-9\right)+870:29\\ =126-\left(-9\right)+30\\ =135+30\\ =165\)

\(7,3m^2=730dm^2\)
\(34,34m^2=343400cm^2\)
\(8.02km^2=8020000m^2\)
\(0,7km^2=70000000m^2\)
\(7,71ha=771m\)