15/34 + 7/21 + 19/34 - 20/15 + 3/7
15 phần 34 + 7 phần 21 +19 phần 34 - 20 phần 15 +3 phần 7 = ?
19 /34 + 7/21 + 15/34 - 20/15 +3/7 = ?
\(\frac{15}{34}+\frac{7}{21}+\frac{19}{34}-\frac{20}{15}+\frac{1}{6}\)
Giúp mình với mà đúng mới like nhé
A/ 15/34+7/21+19/37-20/15+3/7
B/ 3/8.27/1/5-51/1/5.3/8+19
C/ -2/7.21/8.-7/2
\(\dfrac{15}{34}-\dfrac{7}{21}+\dfrac{19}{34}-\dfrac{15}{17}-\dfrac{2}{3}\)
\(\frac{35}{34}\)+ \(\frac{7}{21}\)+ \(\frac{19}{54}\)+\(\frac{20}{15}\)+\(\frac{2016}{2017}\)
TÍNH :
\(A=\frac{\frac{5}{18}+\frac{6}{19}+\frac{7}{20}+\frac{8}{21}+....+\frac{21}{34}-17}{\frac{1}{1.2}+\frac{1}{3.4}+\frac{1}{5.6}+....+\frac{1}{33.34}}\)