Question

[Bùi Anh Đào]

rút gọn rồi tinhs

45/135,117/234,1515/2727,232323/494949

tìm x

(x-1/3)+1/4=1/2

x-(1/7+2/5)=16/35

x+3/7=2/5+3/10

Answer 1

[Minh Hồng]

\(\dfrac{45}{135}=\dfrac{45:45}{135:45}=\dfrac{1}{3}\)

\(\dfrac{117}{234}=\dfrac{117:117}{234:117}=\dfrac{1}{2}\)

\(\dfrac{1515}{2727}=\dfrac{1515:303}{2727:303}=\dfrac{5}{9}\)

\(\dfrac{232323}{494949}=\dfrac{232323:10101}{494949:10101}=\dfrac{23}{49}\)

\(\left(x-\dfrac{1}{3}\right)+\dfrac{1}{4}=\dfrac{1}{2}\)

\(x-\dfrac{1}{3}=\dfrac{1}{2}-\dfrac{1}{4}\)

\(x-\dfrac{1}{3}=\dfrac{2}{4}-\dfrac{1}{4}\)

\(x-\dfrac{1}{3}=\dfrac{1}{4}\)

\(x=\dfrac{1}{4}+\dfrac{1}{3}\)

\(x=\dfrac{3}{12}+\dfrac{4}{12}\)

\(x=\dfrac{7}{12}\)

\(x-\left(\dfrac{1}{7}+\dfrac{2}{5}\right)=\dfrac{16}{35}\)

\(x-\left(\dfrac{5}{35}+\dfrac{14}{35}\right)=\dfrac{16}{35}\)

\(x-\dfrac{19}{35}=\dfrac{16}{35}\)

\(x=\dfrac{16}{35}+\dfrac{19}{35}\)

\(x=\dfrac{35}{35}\)

\(x=1\)

\(x+\dfrac{3}{7}=\dfrac{2}{5}+\dfrac{3}{10}\)

\(x+\dfrac{3}{7}=\dfrac{4}{10}+\dfrac{3}{10}\)

\(x+\dfrac{3}{7}=\dfrac{7}{10}\)

\(x=\dfrac{7}{10}-\dfrac{3}{7}\)

\(x=\dfrac{49}{70}-\dfrac{30}{70}\)

\(x=\dfrac{19}{30}\)

Answer 2

[Minh Hồng]

aaa=))) mik nhầm nha bn sửa 19/30 thành 19/70 nha:v