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9 x 8 x 5 / 6 x 4 x 15 = 9 x 4 x 2 x 5 / 6 x 4 x 3x 5 = 9 x 2 / 6 x 3 = 3 x 3 /2 x 3=3/2
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= \(\frac{3x3x4x4x5}{3x2x4x5x3}=\frac{4x5}{2}=\frac{20}{2}=10\)
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a, \(\frac{2x3x4x5}{3x4x5x6}\)= \(\frac{2}{6}\)=\(\frac{1}{3}\)
b, \(\frac{9x8x5}{6x4x15}\)=\(\frac{3x3x4x2x5}{2x3x4x3x5}\)=1
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\(\frac{1}{4}+\frac{3}{5}=\frac{17}{20}\)
\(\frac{5}{2}+\frac{7}{9}=\frac{59}{18}\)
\(\frac{3}{2}+\frac{2}{3}=\frac{13}{6}\)
\(\frac{4}{5}+\frac{3}{2}=\frac{23}{10}\)
\(\frac{4}{5}+\frac{3}{15}=\frac{4}{5}+\frac{1}{5}=1\)
\(\frac{2}{3}+\frac{32}{24}=\frac{2}{3}+\frac{4}{3}=2\)
\(\frac{5}{6}+\frac{15}{18}=\frac{5}{6}+\frac{5}{6}=\frac{10}{6}=\frac{5}{3}\)
\(\frac{8}{15}+\frac{2}{3}=\frac{8}{15}+\frac{10}{15}=\frac{18}{15}=\frac{6}{5}\)
\(\frac{3}{7}+\frac{4}{8}=\frac{24}{56}+\frac{28}{56}=\frac{52}{56}=\frac{13}{14}\)
_HT_
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\(\dfrac{3}{4}+\dfrac{1}{8}+\dfrac{7}{8}+\dfrac{5}{4}=\left(\dfrac{3}{4}+\dfrac{5}{4}\right)+\left(\dfrac{1}{8}+\dfrac{7}{8}\right)\\ =2+1=3\)
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