Question

[νì ¢υộ¢ đờι ℓà инữиɢ иιềм đαυ]

Tính nhanh:

\(A=\dfrac{5}{13}=\dfrac{-5}{7}+\dfrac{-20}{41}+\dfrac{8}{13}+\dfrac{-21}{41}\)

Answer 1

[Nguyễn Lê Phước Thịnh]

Ta có: \(A=\dfrac{5}{13}+\dfrac{-5}{7}+\dfrac{-20}{41}+\dfrac{8}{13}+\dfrac{-21}{41}\)

\(=\left(\dfrac{5}{13}+\dfrac{8}{13}\right)+\left(\dfrac{-20}{41}+\dfrac{-21}{41}\right)+\dfrac{-5}{7}\)

\(=1-1+\dfrac{-5}{7}\)

\(=\dfrac{-5}{7}\)

Answer 2

[Nguyễn Xuân Nghĩa (Xin ko on vài....]

Có 2 dấu = hả bạn