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$\frac{2}{3} = \frac{{2 \times 3}}{{3 \times 3}} = \frac{6}{9}$
$\frac{3}{4} = \frac{{3 \times 3}}{{4 \times 3}} = \frac{9}{{12}}$
Vậy $\frac{2}{3} = \frac{6}{9}$ ; $\frac{3}{4} = \frac{9}{{12}}$
\(\dfrac{2}{3}=\dfrac{6}{9}\)
\(\dfrac{3}{4}=\dfrac{9}{12}\)
$\frac{4}{6} = \frac{{4:2}}{{6:2}} = \frac{2}{3}$ ; $\frac{8}{{12}} = \frac{{8:4}}{{12:4}} = \frac{2}{3}$
$\frac{{10}}{{15}} = \frac{{10:5}}{{15:5}} = \frac{2}{3}$ ; $\frac{{14}}{{21}} = \frac{{14:7}}{{21:7}} = \frac{2}{3}$
Vậy các phân số đã cho bằng nhau.
\(\dfrac{4}{6}=\dfrac{4:2}{6:2}=\dfrac{2}{3};\dfrac{8}{12}=\dfrac{8:4}{12:4}=\dfrac{2}{3}\)
\(\dfrac{10}{15}=\dfrac{10:5}{15:5}=\dfrac{2}{3};\dfrac{14}{21}=\dfrac{14:7}{21:7}=\dfrac{2}{3}\)
Do đó: \(\dfrac{4}{6}=\dfrac{8}{12}=\dfrac{10}{15}=\dfrac{14}{21}\)
Ta có: $\frac{6}{8} = \frac{{6:2}}{{8:2}} = \frac{3}{4}$
$\frac{{15}}{{60}} = \frac{{15:15}}{{60:15}} = \frac{1}{4}$
$\frac{{42}}{{56}} = \frac{{42:14}}{{56:14}} = \frac{3}{4}$
Vậy phân số $\frac{3}{4}$ , $\frac{{42}}{{56}}$ bằng $\frac{6}{8}$
$\frac{{15}}{6} = \frac{{15:3}}{{6:3}} = \frac{5}{2}$
$\frac{{12}}{{16}} = \frac{{12:4}}{{16:4}} = \frac{3}{4}$
$\frac{{35}}{{105}} = \frac{{35:35}}{{105:35}} = \frac{1}{3}$
\(\dfrac{18}{6}=18:6\)
\(\dfrac{50}{10}=50:10\)
\(\dfrac{15}{15}=15:15\)
\(\dfrac{12}{24}=12:24\)
\(\frac{5}{6}=\frac{5x4}{6x4}=\frac{20}{24}\)
\(\frac{9}{8}=\frac{9x3}{8x3}=\frac{27}{24}\)
\(\frac{5}{6}\)và\(\frac{9}{8}\)
\(\frac{5}{6}=\frac{5\times4}{6\times4}=\frac{20}{24}\)
\(\frac{9}{8}=\frac{9\times3}{8\times3}=\frac{27}{24}\)
15/20=3/4 6/8cung=3/4 =>15/20=6/8
giải thích đi ai xong trước cho ****