Question

a, Viet phan so 7/8 duoi dang tong cua 3 phan so co cung tu so

b, Tinh: ( 1- 1/2 )x(1 - 1/3 )x(1- 1/4 )x(1 - 1/5 )

Answer 1

a) đây chỉ là 1 trong nhiều cách

\(\frac{7}{8}=\frac{1}{8}+\frac{4}{8}+\frac{2}{8}\)

Answer 2

a) \(\frac{7}{8}=\frac{1}{2}+\frac{1}{4}+\frac{1}{8}\)

b) \(\left(1-\frac{1}{2}\right).\left(1-\frac{1}{3}\right).\left(1-\frac{1}{4}\right).\left(1-\frac{1}{5}\right)\)

\(=\frac{1}{2}.\frac{2}{3}.\frac{3}{4}.\frac{4}{5}\)

\(=\frac{1.2.3.4.}{2.3.4.5}\)

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

( Dấu chấm là dấu nhân nha bạn )

Answer 3

1/8 + 7/8 + 0/8

Answer 4

\(a;\)

\(\frac{7}{8}=\frac{1}{8}+\frac{2}{8}+\frac{4}{8}\)

\(\Rightarrow\frac{7}{8}=\frac{1}{8}+\frac{1}{4}+\frac{1}{2}\)

Answer 5

\(b;\)

\(\left(1-\frac{1}{2}\right)\times\cdot\cdot\cdot\times\left(1-\frac{1}{5}\right)\)

\(=\frac{1}{2}\times\cdot\cdot\cdot\times\frac{4}{5}\)

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