\(\frac{10}{7}=\frac{5}{21}\)x \(\alpha\)

5 bạn nhé

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

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

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

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

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

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

\(y=2\)

M=5 nhé bạn , rất dễ mà

\(\frac{242}{363}+\frac{1616}{2121}=\frac{2}{7}.\frac{2015}{A}\)

\(\frac{11.11.2}{11.11.3}+\frac{101.16}{101.21}=\frac{2}{7}.\frac{2015}{A}\)

\(\frac{2}{3}+\frac{16}{21}=\frac{2}{7}.\frac{2015}{A}\)

\(\Rightarrow\frac{2}{7}.\frac{2015}{A}=\frac{10}{7}\)

\(\frac{2015}{A}=\frac{10}{7}:\frac{2}{7}\)

\(\frac{2015}{A}=5\)

\(A=2015:5\)

\(A=403\)

\(\left(\frac{242}{363}+\frac{1616}{2121}\right)=\frac{2}{7}.\frac{2015}{A}\)

\(\Leftrightarrow\left(\frac{2}{3}+\frac{16}{21}\right)=\frac{2}{7}.\frac{2015}{A}\)

\(\Leftrightarrow\frac{10}{7}=\frac{2}{7}.\frac{2015}{A}\)

\(\Leftrightarrow5=\frac{2015}{A}\)

\(\Leftrightarrow A=403\)

=> 10/7 = 2/7 . x

=> 2/7 . x = 10/7

=>         x = 10/7 : 2/7

=>         x = 5

5 nha bạn 

Bài làm

a)100-7.(X.5)=58

          7.(X.5)=100-58

         7.(X.5)=42

            X.5=42:7

           X.5=6

          X    =6:5

         X=1,2.

#)Giải :

a) \(100-7\times\left(x\times5\right)=58\)

\(\Leftrightarrow7\times\left(x\times5\right)=42\)

\(\Leftrightarrow x\times5=6\)

\(\Leftrightarrow x=1,2\)

b) \(x\times\frac{2}{7}=\frac{242}{363}\times\frac{1616}{2121}\)

\(\Leftrightarrow x\times\frac{2}{7}=\frac{2}{3}\times\frac{16}{21}\)

\(\Leftrightarrow x\times\frac{2}{7}=\frac{32}{63}\)

\(\Leftrightarrow x=\frac{16}{9}\)

242/363 + 1616/2121 = 2/7 x a

10/7 = 2/7 x a

a = 10/7 : 2/7

a = 5

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