Question

[ღTruzgღ★ - FϏ]

giúp mk vs!!!

Answer 1

[Vũ Tùng Giang]

Trả lời

a) \(\frac{11}{14}\)- \(\frac{3}{x}\)= \(\frac{5}{14}\). Mà \(\frac{11}{14}\)- \(\frac{5}{14}\)= \(\frac{6}{14}\)= \(\frac{3}{7}\).Vậy nên \(\frac{3}{x}\)= \(\frac{3}{7}\)

\(\frac{x}{13}\)+ \(\frac{15}{26}\)= \(\frac{46}{52}\). Mà \(\frac{46}{52}\)- \(\frac{15}{26}\)= \(\frac{23}{26}\)-\(\frac{15}{26}\)= \(\frac{8}{26}\)= \(\frac{4}{13}\). Vậy nên \(\frac{x}{13}\)=\(\frac{4}{13}\)

Answer 2

[Xyz OLM]

a) \(\frac{11}{14}-\frac{3}{x}=\frac{5}{14}\)

=> \(\frac{3}{x}=\frac{11}{14}-\frac{5}{14}\)

=> \(\frac{3}{x}=\frac{3}{7}\)

=> x = 7

Vậy x = 7

b) \(\frac{x}{13}+\frac{15}{26}=\frac{46}{52}\)

=> \(\frac{4x+30}{52}=\frac{46}{52}\)

=> 4x + 30 = 46

=> 4x = 16

=> x = 4

Vậy x = 4