Question

tính bằng 2 cách:

a).(1/5+3/5)x1/4

(1/5+3/5)x1/4

b).(7/9-2/9)x3/2

(7/9-2/9)x3/2

c).(11/13-9/13)x39/21

(11/13-9/13)x39/21

ai làm day du 2 cach tung cau minh tick.luu y:day du loi giai

Answer 1

a) \(\left(\frac{1}{5}+\frac{3}{5}\right)\times\frac{1}{4}\)

\(=\frac{4}{5}\times\frac{1}{4}\)

\(=\frac{4}{20}=\frac{1}{5}\)

\(\left(\frac{1}{5}+\frac{3}{5}\right)\times\frac{1}{4}=\frac{1}{5}\times\frac{1}{4}+\frac{3}{5}\times\frac{1}{4}\)

                                  \(=\frac{1}{20}+\frac{3}{20}\)

                                    \(=\frac{4}{20}=\frac{1}{5}\)

b) \(\left(\frac{7}{9}-\frac{2}{9}\right)\times\frac{3}{2}\)

\(=\frac{5}{9}\times\frac{3}{2}\)

\(=\frac{15}{18}=\frac{5}{6}\)

\(\left(\frac{7}{9}-\frac{2}{9}\right)\times\frac{3}{2}=\frac{7}{9}\times\frac{3}{2}-\frac{2}{9}\times\frac{3}{2}\)

                                  \(=\frac{21}{18}-\frac{6}{18}\)

                                   \(=\frac{15}{18}=\frac{5}{6}\)

c) \(\left(\frac{11}{13}-\frac{9}{13}\right)\times\frac{39}{21}\)

\(=\frac{2}{13}\times\frac{39}{21}\)

\(=\frac{78}{273}=\frac{2}{7}\)

\(\left(\frac{11}{13}-\frac{9}{13}\right)\times\frac{39}{21}=\frac{11}{13}\times\frac{39}{21}-\frac{9}{13}\times\frac{39}{21}\)

                                       \(=\frac{429}{273}-\frac{351}{273}\)

                                         \(=\frac{78}{273}=\frac{2}{7}\)

Answer 2

a,\(\left(\frac{1}{5}+\frac{3}{5}\right)x\frac{1}{4}\)

=\(\frac{4}{5}x\frac{1}{4}\)

=\(\frac{4}{20}\)

=\(\frac{1}{5}\)

,\(\left(\frac{1}{5}+\frac{3}{5}\right)x\frac{1}{4}\)

=\(\frac{4}{5}x\frac{1}{4}\)

=\(\frac{4x1}{5x4}\)

=\(\frac{1x1}{5x1}\)

=\(\frac{1}{5}\)