Question

            Tìm x, biết:

a)\(\left(\frac{2}{3}+\frac{2}{5}\right).x=\frac{1}{5}-2\frac{1}{2}\)

b)\(\frac{4}{7}.x-\frac{2}{3}=\frac{1}{5}\)

Answer 1

a)\(\left(\frac{2}{3}+\frac{2}{5}\right)x=\frac{1}{5}-2\frac{1}{2}\)

                   \(\frac{16}{15}x=\frac{1}{5}-1\)

                    \(\frac{16}{15}x=-\frac{4}{5}\)

                     \(x=-\frac{4}{5}\div\frac{16}{15}\)

                    \(x=-\frac{3}{4}\)

b)\(\frac{4}{7}x-\frac{2}{3}=\frac{1}{5}\)

               \(\frac{4}{7}x=\frac{1}{5}+\frac{2}{3}\)

               \(\frac{4}{7}x=\frac{13}{15}\)

                     \(x=\frac{13}{15}\div\frac{4}{7}\)

                     \(x=\frac{91}{60}\)

Answer 2

\(\left(\frac{2}{3}+\frac{1}{5}\right)\)CHỨ HK PHẢI LÀ \(\left(\frac{2}{3}+\frac{2}{5}\right)\)ĐÂU Ạ

                 CHO MK XIN LỖI VÌ GHI SAI ĐẦU BÀI