Question

Tính \(y=\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}+\frac{1}{32}\)

Answer 1

31/32               

Answer 2

\(\frac{31}{32}\)                                                         

Answer 3

\(y=\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}+\frac{1}{32}\)

\(y=\frac{1}{2}\times\left(1+\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}\right)\)

\(y=\frac{1}{2}\times\frac{31}{16}\)

\(y=\frac{31}{32}\)

Answer 4

31/32 nha bạn

Answer 5

y=1/2x[1+1/2+1/4+1/8+1/16]

  =1/2x31/16

   =31/32

Answer 6

Y=\(\frac{31}{32}\)

Answer 7

\(y=\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}+\frac{1}{32}\)

\(y=\left(\frac{1}{2}+\frac{1}{4}+\frac{1}{8}\right)+\left(\frac{1}{16}+\frac{1}{32}\right)\)

\(y=\left(\frac{4}{8}+\frac{2}{8}+\frac{1}{8}\right)+\left(\frac{2}{32}+\frac{1}{32}\right)\)

\(y=\frac{7}{8}+\frac{3}{32}\)

\(y=\frac{28}{32}+\frac{3}{32}=\frac{31}{32}\)

Answer 8

\(y=\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}+\frac{1}{32}\)

\(2y=\left(\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}+\frac{1}{32}\right)\times2\)

\(2y=\frac{1}{2}\times2+\frac{1}{4}\times2+\frac{1}{8}\times2+\frac{1}{16}\times2+\frac{1}{32}\times2\)

\(2y=1+\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}\)

\(2y-y=\left(1+\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}\right)-\left(\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}+\frac{1}{32}\right)\)

\(y=1-\frac{1}{32}\)

\(y=\frac{31}{32}\)

Answer 9

\(y=\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16} +\frac{1}{32}\)

\(=\frac{1}{2}.\left(1+\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}\right)\)

\(=\frac{1}{2}.\frac{31}{16}\)

\(=\frac{31}{32}\)