Question

[Trần Đức Đạt]

1/10 + 2/10 + 3/10 + 4/10 + 5/10 + 6/10 + 7/10 + 8/10 + 9/10 tinh nhanh

Answer 1

[çá﹏๖ۣۜhⒺo╰‿╯²ᵏ⁹]

 \(\dfrac{1}{10}+\dfrac{2}{10}+\dfrac{3}{10}+\dfrac{4}{10}+\dfrac{5}{10}+\) \(\dfrac{6}{10}+\dfrac{7}{10}+\dfrac{8}{10}+\dfrac{9}{10}\)

\(=\dfrac{1+2+3+4+5+6+7+8+9}{10}\)

\(=\dfrac{45}{10}=\dfrac{9}{2}\)

Answer 2

[Dương Quỳnh Chi]

1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9/10 = 44/10 = 22/5