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\(\frac{15}{16}:\frac{25}{24}=\frac{15}{16}\cdot\frac{24}{25}=\frac{15\cdot24}{16\cdot25}=\frac{9}{10}\)
a) $\frac{1}{2} - \frac{1}{4} = \frac{2}{4} - \frac{1}{4} = \frac{1}{4}$
b) $\frac{2}{3} - \frac{4}{{15}} = \frac{{10}}{{15}} - \frac{4}{{15}} = \frac{6}{{15}} = \frac{2}{5}$
c) $\frac{3}{5} - \frac{{10}}{{25}} = \frac{{15}}{{25}} - \frac{{10}}{{25}} = \frac{5}{{25}} = \frac{1}{5}$
a) $\frac{4}{{25}}:\frac{4}{3} = \frac{4}{{25}} \times \frac{3}{4} = \frac{3}{{25}}$
b) $\frac{3}{{14}}:\frac{6}{7} = \frac{3}{{14}} \times \frac{7}{6} = \frac{{3 \times 7}}{{14 \times 6}} = \frac{{3 \times 7}}{{7 \times 2 \times 3 \times 2}} = \frac{1}{4}$
c) $\frac{{12}}{{15}}:2 = \frac{{12}}{{15}} \times \frac{1}{2} = \frac{{12 \times 1}}{{15 \times 2}} = \frac{{6 \times 2 \times 1}}{{15 \times 2}} = \frac{6}{{15}}$
d) $\frac{{21}}{8}:6 = \frac{{21}}{8} \times \frac{1}{6} = \frac{{21 \times 1}}{{8 \times 6}} = \frac{{7 \times 3 \times 1}}{{8 \times 3 \times 2}} = \frac{7}{{16}}$
\(\frac{15}{x}=\frac{25}{35}\)
\(\Rightarrow x\times25=15\times35\)
\(\Rightarrow x\times25=525\)
\(\Rightarrow x=525:25\)
\(\Rightarrow x=21\)
Ta có \(\frac{1}{25}\times\frac{5}{25}\)
\(=\frac{1.5}{25.25}\)
\(=\frac{1.5}{5.5.25}\)
\(=\frac{1}{5.25}\)
\(=\frac{1}{125}\)
\(\frac{1}{15}x\frac{5}{25}=\frac{1}{15}x\frac{1}{5}=\frac{1.1}{15.5}=\frac{1}{75}\)
Vậy nha. k nha
\(\frac{7}{5}-\frac{15}{25}=\frac{7}{5}-\frac{3}{5}=\frac{4}{5}\)
Học tốt
\(\frac{7}{5}\)-\(\frac{15}{25}\)=\(\frac{7}{5}\)-\(\frac{3}{5}\)=\(\frac{4}{5}\)
chúc bạn học tốt !!!
\(=\frac{\left(15+125\right).12:2}{14.11+14.19}\)
\(=\frac{840}{14.30}\)
\(=\frac{14.30.2}{14.30}\)
\(=2\)
\(\frac{15+25+35+...+125}{14.11+14.19}\)= \(\frac{\left(125+15\right).\left(\left(125-15\right):10+1\right):2}{14\left(11+19\right)}\)= \(\frac{140.12:2}{14.20}\)= \(\frac{840}{280}\)= 3