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\(\frac{5}{9}\times\frac{8}{17}+\frac{4}{9}\times\frac{8}{17}\)
\(=\left(\frac{5}{9}+\frac{4}{9}\right)\times\frac{8}{17}\)
\(=1\times\frac{8}{17}\)
\(=\frac{8}{17}\)
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\(\frac{3}{8}=\frac{3\cdot4}{8\cdot4}=\frac{12}{32}\)
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\(\dfrac{3}{4}.\dfrac{2}{3}-\dfrac{1}{6}.\dfrac{3}{4}-\dfrac{3}{4}.\dfrac{1}{2}\)
= \(\dfrac{3}{4}.\left(\dfrac{2}{3}-\dfrac{1}{6}-\dfrac{1}{2}\right)\)
= \(\dfrac{3}{4}.0\)
= 0
\(\dfrac{3}{4}\cdot\dfrac{2}{3}-\dfrac{1}{6}\cdot\dfrac{3}{4}-\dfrac{3}{4}\cdot\dfrac{1}{2}\)
\(=\dfrac{3}{4}\left(\dfrac{2}{3}-\dfrac{1}{6}-\dfrac{1}{2}\right)\)
\(=\dfrac{3}{4}\cdot\left(\dfrac{4}{6}-\dfrac{1}{6}-\dfrac{3}{6}\right)\)
=0
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\(\frac{3}{4}+\frac{5}{9}:\frac{4}{5}=\frac{3}{4}+\frac{5}{9}\times\frac{5}{4}\)
\(=\frac{3}{4}+\frac{25}{36}=\frac{27}{36}+\frac{25}{36}=\frac{27+25}{36}=\frac{52}{36}=\frac{13}{9}\)
\(\frac{7}{19}\times\frac{4}{7}-\frac{7}{19}\times\frac{3}{7}=\frac{7}{19}\times\left(\frac{4}{7}-\frac{3}{7}\right)\)
\(=\frac{7}{19}\times\frac{1}{7}=\frac{1}{19}\)
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\(\dfrac{3}{4}\cdot\dfrac{2}{5}-\dfrac{3}{4}\cdot\dfrac{2}{7}\)
= \(\dfrac{3}{4}\cdot\left(\dfrac{2}{5}-\dfrac{2}{7}\right)\)
= \(\dfrac{3}{4}\cdot\left(\dfrac{14}{35}-\dfrac{10}{35}\right)\)
= \(\dfrac{3}{4}\cdot\dfrac{4}{35}\)
= \(\dfrac{3}{35}\)
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1/5 * 2/6 * 3/7 * 4 = 1/5 * 1/3 * 3/7 * 4
= 1/5 * 1/7 * 4
= 1/35 * 4
= 1/140
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Suy ra
9 x 8 x 7 x 6/3 x 2 x 4 x 5 = 40320
nếu đúng k mk nha
![](https://rs.olm.vn/images/avt/0.png?1311)
a)Phân số nghịch đảo của phân số \(\frac{3}{7}\) là \(\frac{7}{3}\)
b)\(\frac{5}{8}\times4\times\frac{1}{2}=\frac{5}{4}\)
HT
a) Phân số nghịch đảo của phân số \(\frac{3}{7}\) là \(\frac{7}{3}\)
b) Tính :
\(\frac{5}{8}\times4\times\frac{1}{2}=\frac{5}{4}\)
TL :
3/8 x 4 = 3/2
= 1,5
HT
= 3/ 2 phân số tối giản nhé bạn