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theo mik nghĩ là 876991010101010101010101010100 văn văn
\(\dfrac{30303}{202020}\) = \(\dfrac{30303:10101}{202020:10101}\) = \(\dfrac{3}{20}\) = \(\dfrac{3\times5}{20\times5}\) = \(\dfrac{15}{100}\) = 0,15 = 15%
=10101x5/10101-10101x5/20202+10101x5/30303-10101x5/40404
=5-5/2+5/3-5/4
=35/12
10101 x ( 5/10101 - 5/20202 + 5/30303 - 5/40404 ) = 10101 x ( 5/10101 - 5/10101x2 + 5/10101x3 - 5/10101 x 4 )
= 10101 x ( 5/10101 x - 5/10101 x 1/2 + 5/10101 x 1/3 - 5/10101 x 1/4 )
= 10101 x 5/10101 x ( 1 - 1/2 + 1/3 - 1/4 )
= 10101 x 5/10101 x 1 - 7/12
= 10101 x 5/10101 x 3/4
= 10101 x 15/40404
= 151515/40404
= 15/4
\(\frac{101010}{252525}\)=\(\frac{101010}{252525}\)/\(\frac{10101}{10101}\) = \(\frac{10}{25}\)=\(\frac{2}{5}\)
\(\dfrac{30303}{101010}\times100=\dfrac{3030300}{101010}=\dfrac{3030300\div101010}{101010\div101010}=\dfrac{30}{1}=30\)