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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
\(\frac{18}{27}-\frac26\)
\(=\frac23-\frac13=\frac{2-1}{3}=\frac13\)
\(\frac{37}{12}-3=\frac{37}{12}-\frac{36}{12}=\frac{37-36}{12}=\frac{1}{12}\)
\(5-\frac{14}{3}=\frac{15}{3}-\frac{14}{3}=\frac{15-14}{3}=\frac13\)
\(\frac{10}{21}:\frac23=\frac{10}{21}\times\frac32=\frac{30}{42}=\frac57\)
\(\frac35:\frac34=\frac35\times\frac43=\frac33\times\frac45=\frac45\)
\(\frac25:\frac{3}{10}=\frac25\times\frac{10}{3}=\frac{20}{15}=\frac43\)
\(\frac38:\frac94=\frac38\times\frac49=\frac{12}{72}=\frac16\)
\(\frac{8}{21}:\frac47=\frac{8}{21}\times\frac74=\frac{7}{21}\times\frac84=\frac23\)
\(\frac85:\frac{15}{8}=\frac85\times\frac{8}{15}=\frac{64}{75}\)
\(\frac{1}{3\times4}+\frac{1}{4\times5}+\frac{1}{5\times6}+...+\frac{1}{11\times12}\)
\(=\frac{4-3}{3\times4}+\frac{5-4}{4\times5}+\frac{6-5}{5\times6}+...+\frac{12-11}{11\times12}\)
\(=\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}+...+\frac{1}{11}-\frac{1}{12}\)
\(=\frac{1}{3}-\frac{1}{12}\)
\(=\frac{1}{4}\)
a } 4 / 5 x 3 /y x 2 / 11 = 24 / 165
= 4/5 x 2/11 x 3/y =24/125
=8/55 x 3/y=24/125
= 24/125:8/55
=33/25
\(\dfrac{3}{5}+\dfrac{4}{25}=\dfrac{19}{25}\)
\(\dfrac{3}{5}+\dfrac{4}{25}\\ =\dfrac{3x5}{5x5}+\dfrac{4}{25}\\ =\dfrac{15}{25}+\dfrac{4}{25}\\ =\dfrac{19}{25}\)
\(=\dfrac{15}{25}+\dfrac{4}{25}=\dfrac{19}{25}\)
\(\dfrac{3}{5}+\dfrac{4}{25}=\dfrac{15}{25}+\dfrac{4}{25}=\dfrac{19}{25}\)
19/25
= 15/25+4/25=19/25