5km= m 6m= cm
10km = dam 10m20cm= cm
chí có ba bn may mắn đúng
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Ban đầu Lan có : 4+4-2=6(cái kẹo)
HT
\(x.13,48+x.5,52+x=40\)
\(x.\left(13,48+5,52+1\right)=40\)
\(x.20=40\)
\(x=40:20\)
\(x=2\)
HT
\(x\times13,48+x\times5,52+x=40\)
\(x\times13,48+x\times5,52+x\times1=40\)
\(x\times\left(13,48+5,52+1\right)=40\)
\(x\times20=40\)
\(x=40:20\)
\(\Rightarrow x=2\)
Vậy x = 2
_HT_
\(\dfrac{4}{3.5}+\dfrac{8}{5\cdot9}+\dfrac{12}{9\cdot15}+...+\dfrac{32}{n\left(n+6\right)}=\dfrac{16}{25}\)
\(2\left(\dfrac{1}{3}-\dfrac{1}{5}\right)+2\left(\dfrac{1}{5}-\dfrac{1}{9}\right)+2\left(\dfrac{1}{9}-\dfrac{1}{15}\right)+...+2\left(\dfrac{1}{n}-\dfrac{1}{n+16}\right)=\dfrac{16}{25}\)
\(2\left(\dfrac{1}{3}-\dfrac{1}{5}+\dfrac{1}{5}-\dfrac{1}{9}+\dfrac{1}{9}-\dfrac{1}{15}+...+\dfrac{1}{n}-\dfrac{1}{n+16}\right)=\dfrac{16}{25}\)
\(2\left(\dfrac{1}{3}-\dfrac{1}{n+16}\right)=\dfrac{16}{25}\)
\(\dfrac{1}{3}-\dfrac{1}{n+16}=\dfrac{8}{25}\)
\(\dfrac{1}{n+16}=\dfrac{1}{75}\)
⇒ \(n+16=75\)
\(\Rightarrow n=59\)
TL
5km=5000m 6m=600cm
10km=1000dam 10m 20 cm=1020
HT
5km=500 m 6m= 600cm
10km = 1000 dam 10m20cm=1020 cm