Question

tìm x

x = 1/4 + 2/13

x/3 = 2/3 + -2/7

Answer 1

a/ \(x=\frac{1}{4}+\frac{2}{13}=\frac{13+8}{52}\)

\(\Rightarrow x=\frac{21}{52}\)

b/ \(\frac{x}{3}=\frac{2}{3}+-\frac{2}{7}\)

\(\Rightarrow\frac{x}{3}=\frac{8}{21}\Rightarrow21x=8.3=24\)

\(\Rightarrow x=\frac{24}{21}=\frac{8}{7}\)

Answer 2

giai

x = 1/4+2\13

x= 13/52+8/52

x=21/52

vay x=21/52

b x/3 = 2/3 +-2/7

x/3= 17/21 + -6/21

x/3 = 11/21

x/3= 11/21