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1000:250=100:25 100:25=20:5=4
50:75=10:15 3:5=6:10
tk nha mk nhanh nhất
1000 / 250 = 100 / 25
100 / 25 = 20 / 5 = 4
50 / 75 = 10 / 15
3 / 5 = 6 / 10
\(\dfrac{1}{3}=\dfrac{2}{6}=\dfrac{3}{9}=\dfrac{4}{12}\)
\(\dfrac{2}{5}=\dfrac{4}{10}=\dfrac{8}{20}=\dfrac{16}{40}\)
\(7,14=\dfrac{714}{100}=\dfrac{357}{50}=\dfrac{3570}{500}\)
\(\dfrac{25}{3}=\dfrac{100}{12}=\dfrac{150}{18}=\dfrac{200}{24}\)
\(\dfrac{25}{15}=\dfrac{5}{3}=\dfrac{10}{6}=\dfrac{15}{9}\)
\(\dfrac{7}{18}+\dfrac{2}{6}=\dfrac{7}{18}+\dfrac{6}{18}=\dfrac{13}{18}\)
\(\frac{1}{3\times4}+\frac{1}{4\times5}+\frac{1}{5\times6}+...+\frac{1}{11\times12}\)
\(=\frac{4-3}{3\times4}+\frac{5-4}{4\times5}+\frac{6-5}{5\times6}+...+\frac{12-11}{11\times12}\)
\(=\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}+...+\frac{1}{11}-\frac{1}{12}\)
\(=\frac{1}{3}-\frac{1}{12}\)
\(=\frac{1}{4}\)
\(\dfrac{3}{5}+\dfrac{4}{25}=\dfrac{19}{25}\)
\(\dfrac{3}{5}+\dfrac{4}{25}\\ =\dfrac{3x5}{5x5}+\dfrac{4}{25}\\ =\dfrac{15}{25}+\dfrac{4}{25}\\ =\dfrac{19}{25}\)