Question

thực hiện phép tính :

a, -7/25 . 11/13 + -7/25 . 2/13 - 18/25 

 

Answer 1

\(a)-7/25*(11/13+2/13)-18/25=-7/25*1-18/25=-7/25-18/25=-25/25=-1\)

Answer 2

\(=-\dfrac{7}{25}\left(\dfrac{11}{13}+\dfrac{2}{13}\right)-\dfrac{18}{25}=-\dfrac{7}{25}.1-\dfrac{18}{25}=-\dfrac{25}{25}=-1\)

Answer 3

\(\dfrac{-7}{25}.\dfrac{11}{13}+\dfrac{-7}{25}.\dfrac{2}{13}-\dfrac{18}{25}\\ =\dfrac{-7}{25}\left(\dfrac{11}{13}+\dfrac{2}{13}\right)-\dfrac{18}{25}\\ =\dfrac{-7}{25}.\dfrac{13}{13}-\dfrac{18}{25}\\ =\dfrac{-7}{25}.1-\dfrac{18}{25}\\ =\dfrac{-7}{25}-\dfrac{18}{25}\\ =\dfrac{-25}{25}\\ =-1\)

Answer 4

\(\dfrac{-7}{25}.\dfrac{11}{13}+\dfrac{-7}{25}.\dfrac{2}{13}-\dfrac{18}{25}\)

\(=\dfrac{-7}{25}.\left(\dfrac{11}{13}+\dfrac{2}{13}\right)-\dfrac{18}{25}=-\dfrac{7}{25}-\dfrac{18}{25}=-\dfrac{25}{25}=-1\)