Question

So sánh A và B biết :
A = [ 0,8 . 7 + (0,8)^2 ] . ( 1,25 . 7 - 4/5 . 1,25 ) - 47,86
B = (1,09 - 0,29) . 5/4 / (18,9 - 16,65) . 8/9

Answer 1

\(A=\left[\dfrac{4}{5}\cdot7+\dfrac{16}{25}\right]\cdot\left(7.75\right)-47.86\)

\(=\dfrac{156}{25}\cdot\dfrac{31}{4}-\dfrac{2793}{50}=\dfrac{-15}{2}\)

\(C=\left(0.8\right)\cdot\dfrac{5}{4}:\dfrac{9}{4}\cdot\dfrac{8}{9}=1\cdot\dfrac{4}{9}\cdot\dfrac{8}{9}=\dfrac{32}{81}\)