Question

(5/7-y)*14/5=7/10+1/2

CHÚ Ý * LÀ NHÂN

Answer 1

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Answer 2

\(\left(\frac{5}{7}-y\right).\frac{14}{5}=\frac{7}{10}+\frac{1}{2}\)

\(\left(\frac{5}{7}-y\right).\frac{14}{5}=\frac{6}{5}\)

\(\frac{5}{7}-y=\frac{6}{5}:\frac{14}{5}\)

\(\frac{5}{7}-y=\frac{3}{7}\)

\(y=\frac{5}{7}-\frac{3}{7}\)

\(y=\frac{2}{7}\)

Answer 3

\(\left(\frac{5}{7}-y\right).\frac{14}{5}=\frac{7}{10}+\frac{1}{2}\)

\(\left(\frac{5}{7}-y\right).\frac{14}{5}=\frac{7}{10}+\frac{5}{10}\)

\(\left(\frac{5}{7}-y\right).\frac{14}{5}=\frac{12}{10}\)

\(\frac{5}{7}-y=\frac{12}{10}:\frac{14}{10}\)

\(\frac{5}{7}-y=\frac{12}{10}.\frac{10}{14}\)

\(\frac{5}{7}-y=\frac{120}{140}=\frac{6}{7}\)

\(\frac{5}{7}-y=\frac{6}{7}\)

\(y=\frac{6}{7}+\frac{5}{7}=\frac{10}{7}\)

mik thấy đề cuối sai thì phải