Question

tính nhanh:

4/19 x -3/7 +-3/7 x15/19 + 5/7

 

Answer 1

mk sẽ ko ghi lại đề nhé

\(=\frac{-3}{7}\cdot\left(\frac{4}{19}+\frac{5}{19}\right)+\frac{5}{7}\)

\(=\frac{-3}{7}\cdot1+\frac{5}{7}\)

\(=\frac{-3}{7}+\frac{5}{7}=\frac{2}{7}\)

Answer 2

\(\frac{4}{19}.\frac{-3}{7}+\frac{-3}{7}.\frac{15}{19}+\frac{5}{7}\)

\(=\frac{-3}{7}\left(\frac{4}{19}+\frac{15}{19}\right)+\frac{5}{7}\)

\(=\frac{-3}{7}.1+\frac{5}{7}\)

\(=\frac{-3}{7}+\frac{5}{7}=\frac{2}{7}\)

Answer 3

-3/7 x ( 4/19 + 15/19 ) + 5/7

= -3/7 x 1 + 5/7

= -3/7 + 5/7 

= 2/7