=-5/7.(2/11+9/11)+5/7
=-5/7.1+5/7
=-5/7+5/7
=0
ta có
-5/7.(2/11+9/11)+5/7
=-5/7.1+5/7
=0
cj ko nhớ cách lm lắm nên có sai đâu thì em sửa nha
\(\dfrac{-5}{7}.\dfrac{2}{11}+\dfrac{-5}{7}.\dfrac{9}{11}+\dfrac{5}{7}\)
= \(\left(\dfrac{2}{11}+\dfrac{9}{11}\right).\dfrac{-5}{7}+\dfrac{5}{7}\)
= 0
-5/7.2/11 + (-5/7).9/11 + 5/7
= -5/7.( 2/11 + 9/11) + 5/7
= -5/7. 11/11 + 5/7
= -5/7.1 + 5/7
= 0
chúc bạn học tốt nhé !
\(\dfrac{-5}{7}\).\(\dfrac{2}{11}\)+\(\dfrac{-5}{7}\).\(\dfrac{9}{11}\)+\(\dfrac{5}{7}\)
= \(\dfrac{-5}{7}\).\(\dfrac{2}{11}\)+\(\dfrac{-5}{7}\).\(\dfrac{9}{11}\)-\(\dfrac{5}{7}\).(-1)
= \(\dfrac{-5}{7}\)(\(\dfrac{2}{11}\)+\(\dfrac{9}{11}\)-\(\dfrac{11}{11}\))
= 0
-5/7.2/11+-5/7.9/11+5/7
=-5/7.(2/11+9/11)+5/7
=-5/7.1+5/7
=-5/7+5/7
=0
