Question

-15/8 x (8/-15 +32/27)-15/7

tính hợp lí

Answer 1

\(=\dfrac{-15}{8}\times\dfrac{8}{-15}-\dfrac{15}{8}\times\dfrac{32}{27}-\dfrac{15}{7}\\=1-\dfrac{20}{9}-\dfrac{15}{7}\\ =\dfrac{1\times9\times7-20\times7-15\times9}{63}=\dfrac{-212}{63}\)