e chia từng bài ra nhe

giúp mik với mai mik nộp cho rồi :((

\(\dfrac{242}{363}+\dfrac{1616}{2121}=\dfrac{2}{7}y\)

\(\dfrac{2\cdot121}{3\cdot121}+\dfrac{16\cdot101}{21\cdot101}=\dfrac{2}{7}y\)

\(\dfrac{2}{7}y=\dfrac{2}{3}+\dfrac{16}{21}\)

\(\dfrac{2}{7}y=\dfrac{10}{7}\)

\(y=\dfrac{10}{7}\div\dfrac{2}{7}=5\)

nhân y mà

242/363 + 1616/ 2121= 5/7 x y

\(\frac{2}{3}+\frac{16}{21}=\frac{5}{7}\)x y

\(\frac{14}{21}\)+\(\frac{16}{21}\)= \(\frac{5}{7}\)x y

\(\frac{10}{7}\)=\(\frac{5}{7}\)x y

\(\frac{10}{7}\): \(\frac{5}{7}\)=y

\(\frac{10}{7}\)x \(\frac{7}{5}\)=y

2=y

vậy y=2

\(\frac{242}{363}+\frac{1616}{2121}=\frac{5}{7}\times y\)

\(\frac{121\times2}{121\times3}+\frac{101\times16}{101\times21}=\frac{5}{7}\times y\)

\(\frac{2}{3}+\frac{16}{21}=\frac{5}{7}\times y\)

\(\frac{10}{7}=\frac{5}{7}\times y\)

\(\Rightarrow y=\frac{10}{7}:\frac{5}{7}\)

\(y=2\)

thank nhoa

=> 10/7 = 2/7 . x

=> 2/7 . x = 10/7

=>         x = 10/7 : 2/7

=>         x = 5

5 nha bạn 

\(\dfrac{242}{ }\)

M=5 nhé bạn , rất dễ mà

5 bạn nhé

\(\left(\dfrac{242}{363}+\dfrac{1616}{2121}\right)=\dfrac{2}{7}.x\)

\(\Leftrightarrow\dfrac{242}{363}\left(1+\dfrac{8}{7}\right)=\dfrac{2}{7}.x\)

\(\Leftrightarrow\dfrac{242}{363}.\dfrac{15}{7}=\dfrac{2}{7}.x\)

\(\Leftrightarrow\dfrac{10}{7}=\dfrac{2}{7}.x\)

\(\Leftrightarrow x=\dfrac{10}{7}:\dfrac{2}{7}\)

\(\Leftrightarrow x=\dfrac{10}{7}.\dfrac{7}{2}\)

\(\Leftrightarrow x=5\)

=>x*2/7=(2/3+16/21)=14/21+16/21=30/21=10/7

=>x=5