Question

tính nhanh

\(\dfrac{-5}{7}.\dfrac{2}{11}+\dfrac{-5}{7}.\dfrac{9}{11}+1\dfrac{5}{7}\)

Answer 1

\(=\dfrac{-5}{7}\left(\dfrac{2}{11}+\dfrac{9}{11}\right)+1+\dfrac{5}{7}=\dfrac{-5}{7}+\dfrac{5}{7}+1=1\)

Answer 2

\(-5/7*2/11+(-5/7)*9/11+12/7=(-5/7)*(2/11+9/11)+12/7=-5/7*1=-5/7+12/7=7/7=1\)nhé =)

Answer 3

\(\dfrac{-5}{7}.\dfrac{2}{11}+\dfrac{-5}{7}.\dfrac{9}{11}+1\dfrac{5}{7}\\ =\dfrac{-5}{7}\left(\dfrac{2}{11}+\dfrac{9}{11}\right)+\dfrac{12}{7}\\ =\dfrac{-5}{7}.\dfrac{11}{11}+\dfrac{12}{7}\\ =\dfrac{-5}{7}+\dfrac{12}{7}\\ =\dfrac{7}{7}\\ =1\)

Answer 4

\(=\dfrac{-5}{7}.\left(\dfrac{2}{11}+\dfrac{9}{11}\right)+\dfrac{12}{7}\\ =\dfrac{-5}{7}.1+\dfrac{12}{7}=1\)