a)Ta có:7/8 = 1/24 + 1/3 +1/2
b)\(\left(1-\frac{1}{2}\right)\times\left(1-\frac{1}{3}\right)\times\left(1-\frac{1}{4}\right)\times\left(1-\frac{1}{5}\right)\)
\(=\frac{1}{2}\times\frac{2}{3}\times\frac{3}{4}\times\frac{4}{5}=\frac{1}{5}\)
Mk làm xong trước đó bn không tin bn kiểm tra thời gian là biết ngay!
a) \(\text{Ta có : }\frac{7}{8}=\frac{1}{8}+\frac{2}{8}+\frac{4}{8}\Leftrightarrow\frac{7}{8}=\frac{1}{8}+\frac{1}{4}+\frac{1}{2}\)
\(\text{Vậy }\frac{7}{8}\text{được viết dưới dạng tổng 3 phân số cùng tử là :}\frac{7}{8}=\frac{1}{8}+\frac{1}{4}+\frac{1}{2}\)
b) \(\left(1-\frac{1}{2}\right)\times\left(1-\frac{1}{3}\right)\times\left(1-\frac{1}{4}\right)\times\left(1-\frac{1}{5}\right)\)
\(=\frac{1}{2}\times\frac{2}{3}\times\frac{3}{4}\times\frac{4}{5}\)
\(=\frac{1\times2\times3\times4}{2\times3\times4\times5}\)
\(=\frac{1}{5}\)
Thank các bạn
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a, \(\frac{7}{8}=\frac{1}{2}+\frac{1}{4}+\frac{1}{16}\)
\(b,\text{ }\left(1-\frac{1}{2}\right)\text{ x }\left(1-\frac{1}{3}\right)\text{ x }\left(1-\frac{1}{4}\right)\text{ x }\left(1-\frac{1}{5}\right)\)
\(=\frac{1}{2}\text{ x }\frac{2}{3}\text{ x }\frac{3}{4}\text{ x }\frac{4}{5}\)
\(=\frac{1}{5}\)
a, \(\frac{7}{8}=\frac{1}{2}+\frac{1}{4}+\frac{1}{16}\)
\(b,\text{ }\left(1-\frac{1}{2}\right)\text{ x }\left(1-\frac{1}{3}\right)\text{ x }\left(1-\frac{1}{4}\right)\text{ x }\left(1-\frac{1}{5}\right)\)
\(=\frac{1}{2}\text{ x }\frac{2}{3}\text{ x }\frac{3}{4}\text{ x }\frac{4}{5}\)
\(=\frac{1}{5}\)
\(a;\)
\(\frac{7}{8}=\frac{1}{8}+\frac{2}{8}+\frac{4}{8}\)
\(\Rightarrow\frac{7}{8}=\frac{1}{8}+\frac{1}{4}+\frac{1}{2}\)
\(b;\)
\(\left(1-\frac{1}{2}\right)\times\left(1-\frac{1}{3}\right)\times\cdot\cdot\cdot\times\left(1-\frac{1}{5}\right)\)
\(=\frac{1}{2}\times\frac{2}{3}\times\cdot\cdot\cdot\times\frac{4}{5}\)
\(=\frac{1}{5}\)
