Question

3/8 +1/4 -2/5

 

Answer 1

\(\frac{3}{8}+\frac{1}{4}-\frac{2}{5}\)

\(=\frac{5}{8}-\frac{2}{5}=\frac{9}{40}\)

\(\frac{1}{5}-\frac{1}{5}:6.\frac{1}{2}\)

\(=\frac{1}{5}-\frac{1}{60}\)

\(=\frac{11}{60}\)

Answer 2

\(\frac{3}{8}+\frac{1}{4}-\frac{2}{5}\)\(=\frac{9}{40}\)

\(\frac{1}{5}-\frac{1}{5}:6x\frac{1}{2}=\frac{11}{60}\)

nha bn

Answer 3

Câu 1 : Lấy mẫu chung là 40,ta có:

15 / 40 + 10 / 40 - 16 / 40 = 15 + 10 - 16 / 40

                                      = 9 / 40

câu 2:  = 1 / 5 + 1 / 30 x 1 / 2

           = 1 / 5 + 1 / 60 = 12 / 60 + 1 / 60 = 13 / 60

Answer 4

\(\frac{3}{8}+\frac{1}{4}-\frac{2}{5}\)

\(=\frac{5}{8}-\frac{2}{5}\)

\(=\frac{9}{40}\)

\(\frac{1}{5}-\frac{1}{5}:6\times\frac{1}{2}\)

\(=\frac{1}{5}-\frac{1}{30}\times\frac{1}{2}\)

\(=\frac{1}{5}-\frac{1}{60}\)

\(=\frac{11}{60}\)

Answer 5

A)\(\frac{3}{8}\)+ \(\frac{1}{4}\)-\(\frac{2}{5}\)= \(\frac{3}{8}\)+\(\frac{2}{8}\)-\(\frac{2}{5}\)=  \(\frac{5}{8}\)-\(\frac{2}{5}\) = \(\frac{25}{40}\)- \(\frac{16}{40}\)=\(\frac{9}{40}\)

B) \(\frac{1}{5}\)-  \(\frac{1}{5}\):  6  x  \(\frac{1}{2}\)=\(\frac{1}{5}\)-\(\frac{1}{30}\) x  \(\frac{1}{2}\)=\(\frac{1}{5}\)- \(\frac{1}{60}\)=\(\frac{12}{60}\)- \(\frac{1}{60}\)

Answer 6

\(\frac{3}{8}+\frac{1}{4}-\frac{2}{5}=\frac{9}{40}\)

\(\frac{1}{5}-\frac{1}{5}:6x\frac{1}{2}=\frac{11}{60}\)

Ai ủng hộ mk, mk rất cảm ơn.