Question

[Nguyễn Thị Huyền Trang]

Tính nhanh 

a) 8/3 + 17/9 + 19/13 + 1/3 + 7/13 +1/9

b)1/2 + 1/4 + 1/8 + 1/16 + 1/32

Answer 1

[Cô Long_Nghiên Hy Trần]

a,

\(\frac{8}{3}+\frac{17}{9}+\frac{19}{13}+\frac{1}{3}+\frac{7}{13}+\frac{1}{9}\)

\(=\left(\frac{8}{3}+\frac{1}{3}\right)+\left(\frac{17}{9}+\frac{1}{9}\right)+\left(\frac{19}{13}+\frac{7}{13}\right)\)

\(=3+2+2\)

\(=7\)