Question

Tính nhanh

a/ 2017 x 8 + 2 x 2017

 

b/3/7 x 9/7 - 2/7 x 3/7

Answer 1

\(a,2017\times\left(8+2\right)=2017\times10=20170\\ b,=\dfrac{3}{7}\times\left(\dfrac{9}{7}-\dfrac{2}{7}\right)=\dfrac{3}{7}\times1=\dfrac{3}{7}\)