Câu hỏi của tran hai thanh

Question

các bạn làm cho mik bài tập 47 và 48 sgk 6 trang 28

Tóc Em Rối Rồi Kìa · Accepted Answer

47)

a) $\dfrac{-3}{7}+\dfrac{5}{13}+\dfrac{-4}{7}$

$=\dfrac{-3}{7}+\dfrac{-4}{7}+\dfrac{5}{13}\
=\dfrac{-7}{7}+\dfrac{5}{13}\
=\dfrac{-13}{13}+\dfrac{5}{13}\
=\dfrac{-8}{13}$

b) $\dfrac{-5}{21}+\dfrac{-2}{21}+\dfrac{8}{24}\
=\dfrac{-7}{21}+\dfrac{1}{3}\
=\dfrac{-1}{3}+\dfrac{1}{3}\
=0$Câu trả lời: 47)

a) $\dfrac{-3}{7}+\dfrac{5}{13}+\dfrac{-4}{7}$

$=\dfrac{-3}{7}+\dfrac{-4}{7}+\dfrac{5}{13}\
=\dfrac{-7}{7}+\dfrac{5}{13}\
=\dfrac{-13}{13}+\dfrac{5}{13}\
=\dfrac{-8}{13}$

b) $\dfrac{-5}{21}+\dfrac{-2}{21}+\dfrac{8}{24}\
=\dfrac{-7}{21}+\dfrac{1}{3}\
=\dfrac{-1}{3}+\dfrac{1}{3}\
=0$

tran hai thanh · Answer

cảm ơn bnCâu trả lời: cảm ơn bn