Question

dấu chấm là nhân, giúp gấp ạ

1/4. 7/3.12                               

3/8.56.25/7. (-4)

3/7.2/5.7/3.20.19/72

1/3.4/5+1/3.6/5

 

Answer 1

a: \(=\dfrac{7}{12}\cdot12=7\)

b: \(=\dfrac{3}{8}\cdot\dfrac{25}{7}\cdot56\cdot\left(-4\right)=-300\)

c: \(=\dfrac{3}{7}\cdot\dfrac{7}{3}\cdot\dfrac{2}{5}\cdot20\cdot\dfrac{19}{72}=8\cdot\dfrac{19}{72}=\dfrac{19}{9}\)

d: \(=\dfrac{1}{3}\left(\dfrac{4}{5}+\dfrac{6}{5}\right)=\dfrac{2}{3}\)