Question

tìm y biết. \(\frac{1}{5}\)x\(\frac{3}{y}\)x\(\frac{4}{7}\)=\(\frac{2x3x4}{5x6x7}\)

Answer 1

\(\frac{1}{5}x\frac{3}{y}x\frac{4}{7}=\frac{2x3x4}{5x6x7}\)

\(\Rightarrow\frac{12}{yx35}=\frac{4}{35}\)

\(\Rightarrow\frac{12}{yx35}=\frac{12}{3x35}\)

=>y=35

Answer 2

\(\frac{1}{5}\times\frac{3}{y}\times\frac{4}{7}=\frac{2\times3\times4}{5\times6\times7}\)

\(\Rightarrow\frac{3}{y}=\frac{2\times3\times4}{5\times6\times7}\div\left(\frac{1}{5}\times\frac{4}{7}\right)\)

\(\Rightarrow\frac{3}{y}=\frac{24}{210}\div\frac{2}{189}\)

\(\Rightarrow\frac{3}{y}=\frac{54}{5}\)

không tồn tại y