Tính nhanh: \(\Large{8\over27} + {4\over15} + {19\over27} +{11\over15}

Tính nhanh:

\(\Large{8\over27} + {4\over15} + {19\over27} +{11\over15}=...\)

• A. Đáp án: 2

$\Large \dfrac{8}{27}+\dfrac{4}{15}+\dfrac{19}{27}+\dfrac{11}{15}$

= $\Large (\dfrac{8}{27} +\dfrac{19}{27})+(\dfrac{4}{15}+\dfrac{11}{15})$

= $\Large \dfrac{27}{27}+\dfrac{15}{15}$

= $\Large 1+1$

= $\Large 2$