Question

[Lương Khánh Huyền]

1,Tính

A, 14/7 + 5/9 + 4/9 - 2

B, 31/25 + ( 15/16 - 6/15 ) + 1/16

C, 23/28 - ( 23/28 - 1/3 ) +2/3

D, 1/12 + 1/20 + 1/30 + 1/42 + 1/56 + 1/72 + 1/90

Answer 1

[nàng tiên mây trắng]

1

Answer 2

[Hải Ninh]

a) \(\frac{14}{7}+\frac{5}{9}+\frac{4}{9}-2\)

\(=2\frac{5}{9}+\frac{4}{9}-2\)

\(=3-2=1\)

b) \(\frac{31}{25}+\left(\frac{15}{16}-\frac{6}{15}\right)+\frac{1}{16}\)

\(=\frac{31}{25}+\frac{43}{80}+\frac{1}{16}\)

\(=1\frac{311}{400}+\frac{1}{16}\)

\(=1\frac{21}{25}\)