Question

[Vu Nha Uyen]

bai 4: tinh bang cach thuan tien nhat: a, 5/9*5/2+4/9*5/2  ,    b, 12*3/4-3/4*12/7 lam kieu gi

giup  minh voi

Answer 1

[⭐Hannie⭐]

\(a,\dfrac{5}{9}\times\dfrac{5}{2}+\dfrac{4}{9}\times\dfrac{5}{2}=\dfrac{5}{2}\times\left(\dfrac{5}{9}+\dfrac{4}{9}\right)=\dfrac{5}{2}\times1=\dfrac{5}{2}\)

\(12\times\dfrac{3}{4}-\dfrac{3}{4}\times\dfrac{12}{7}=\dfrac{3}{4}\times\left(12-\dfrac{12}{7}\right)=\dfrac{3}{4}\times\dfrac{72}{7}=\dfrac{54}{7}\)