Question

Tính bằng cách thuận tiện nhất :

49 /5 - 1/2 1/4 -1/8 -1/16 -1/32

Answer 1

  

Answer 2

  

Answer 3

\(A=\dfrac{49}{5}-\left(\dfrac{1}{2}+\dfrac{1}{4}+\dfrac{1}{8}+\dfrac{1}{16}+\dfrac{1}{32}\right)\)

\(A=\dfrac{49}{5}-\left(1-\dfrac{1}{2}+\dfrac{1}{2}-\dfrac{1}{4}+\dfrac{1}{4}-\dfrac{1}{8}+\dfrac{1}{8}-\dfrac{1}{16}+\dfrac{1}{16}-\dfrac{1}{32}\right)\)

\(A=\dfrac{49}{5}-\left(1-\dfrac{1}{32}\right)=\text{​​}\dfrac{49}{5}-\dfrac{31}{32}\text{​​}\)

\(A=\dfrac{1413}{160}\text{​​}\)

Answer 4

A=549​−(21​+41​+81​+161​+321​)

�=495−(1−12+12−14+14−18+18−116+116−132)A=549​−(1−21​+21​−41​+41​−81​+81​−161​+161​−321​)

�=495−(1−132)=​​495−3132​​A=549​−(1−321​)=​​549​−3231​​​

�=1413160​​A=1601413​​​

Answer 5

A=549​−(21​+41​+81​+161​+321​)

�=495−(1−12+12−14+14−18+18−116+116−132)A=549​−(1−21​+21​−41​+41​−81​+81​−161​+161​−321​)

�=495−(1−132)=​​495−3132​​A=549​−(1−321​)=​​549​−3231​​​

�=1413160​​A=1601413​

Answer 6

A=549​−(21​+41​+81​+161​+321​)

�=495−(1−12+12−14+14−18+18−116+116−132)A=549​−(1−21​+21​−41​+41​−81​+81​−161​+161​−321​)

�=495−(1−132)=​​495−3132​​A=549​−(1−321​)=​​549​−3231​​​

�=1413160​​A=1601413​​​