Question

Tính bằng cách hợp lí nhất:

a, 7/5 + 7/2 + 8/5 + 12/13 + 1/2 + 27/13

Answer 1

\(\dfrac{7}{5}+\dfrac{8}{5}+\dfrac{7}{2}+\dfrac{1}{2}+\dfrac{12}{13}+\dfrac{27}{13}=\dfrac{15}{5}+\dfrac{8}{2}+\dfrac{39}{13}=3+4+3=10\)

Answer 2

a) \(\dfrac{7}{5}+\dfrac{7}{2}+\dfrac{8}{5}+\dfrac{12}{13}+\dfrac{1}{2}+\dfrac{27}{13}=\left(\dfrac{7}{5}+\dfrac{8}{5}\right)+\left(\dfrac{7}{2}+\dfrac{1}{2}\right)+\left(\dfrac{12}{13}+\dfrac{27}{13}\right)\)\(=3+4+3=10\)

Answer 3

= ( 7/5+ 8/5) + ( 7/2+ 1/2) + ( 12/13+ 27/13)

= 3 + 4+ 3

= 10

Answer 4

10

Answer 5

\(=\left(\dfrac{7}{5}+\dfrac{8}{5}\right)+\left(\dfrac{7}{2}+\dfrac{1}{2}\right)+\left(\dfrac{12}{13}+\dfrac{27}{13}\right)\)

\(=3+4+3=10\)

Answer 6

a, =\(\left(\dfrac{7}{5}+\dfrac{8}{5}\right)+\left(\dfrac{7}{2}+\dfrac{1}{2}\right)+\left(\dfrac{12}{13}+\dfrac{27}{13}\right)\)

    =\(3+4+3\)

    =\(10\)

Answer 7

7/5+8/5+7/2+1/2+12/13+27/13=15/5+8/2+39/13=3+4+3=10