Question

2. Tính: A) 2/3 + 5/6 + 1/18. B) 3/4 + 2/25 + 7/100. C) 1/12 + 1/6 + 3/4.

Answer 1

\(a,\dfrac{2}{3}+\dfrac{5}{6}+\dfrac{1}{18}=\dfrac{12}{18}+\dfrac{15}{18}+\dfrac{1}{18}=\dfrac{28}{18}=\dfrac{14}{9}\)

\(b,\dfrac{3}{4}+\dfrac{2}{25}+\dfrac{7}{100}=\dfrac{75}{100}+\dfrac{8}{100}+\dfrac{7}{100}=\dfrac{90}{100}=\dfrac{9}{10}\)

\(c,\dfrac{1}{12}+\dfrac{1}{6}+\dfrac{3}{4}=\dfrac{1}{12}+\dfrac{2}{12}+\dfrac{9}{12}=\dfrac{12}{12}=1\)

Answer 2

a)

`2/3 +5/6+1/18`

`=12/18 +15/18 +1/18`

`=28/18`

`=14/9`

b)

`3/4 +2/25+7/100`

`=75/100 +8/100 +7/100`

`=90/100`

`=9/10`

c)

`1/12 +1/6+3/4`

`=1/12+2/12+9/12`

`=12/12`

`=1`