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Erza
a) \(\frac{3}{5}-\frac{1}{3}-\frac{1}{6}=\frac{18}{30}-\frac{10}{30}-\frac{5}{30}=\frac{18-10-5}{30}=\frac{1}{10}\)
b) \(\frac{4}{7}\times\frac{5}{8}\times\frac{7}{12}=\frac{4\times5\times7}{7\times8\times12}=\frac{140}{672}=\frac{5}{24}\)
c) \(\frac{25}{28}\div\frac{15}{14}\times\frac{6}{7}=\frac{25}{28}\times\frac{14}{15}\times\frac{6}{7}=\frac{25\times14\times6}{28\times15\times7}=\frac{2100}{2940}=\frac{5}{7}\)
Thấy đúg thì tk nha các bn !!
a,3/5 - 1/3 - 1/6
= 4/9 - 1/6
= 5/9
b,4/7x5/8x7/12
= 5/14 x 7/12
= 5/24
c,25/18 :15/14 x 6/7
= 25/28 x 14/15 x 6/7
= 5/6 x 6/7
= 5/7
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\(\frac{1}{5}\cdot\frac{1}{7}+\frac{4}{5}+\frac{1}{5}\cdot\frac{12}{7}-1-\frac{1}{5}\cdot\frac{6}{7}\)
\(=\frac{1}{5}\cdot\left(\frac{1}{7}+\frac{12}{7}-\frac{6}{7}\right)-\left(1-\frac{4}{5}\right)\)
\(=\frac{1}{5}.1-\frac{1}{5}\)
\(=\frac{1}{5}-\frac{1}{5}=0\)
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\(\frac{3}{24}+\frac{1}{6}\)\(+\)\(\frac{5}{6}+\frac{7}{12}\)
\(=\frac{3}{24}+\frac{4}{24}+\frac{20}{24}+\frac{14}{24}\)
\(=\frac{3+4+20+14}{24}\)
\(=\frac{41}{24}\)
\(\frac{3}{7}+\frac{4}{5}+\frac{2}{1}\)
\(=\frac{15}{35}+\frac{28}{35}+\frac{2}{1}\)
= \(\frac{15}{35}+\frac{28}{35}+\frac{70}{35}\)
\(\frac{15+28+70}{35}\)
\(=\frac{113}{35}\)
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\(\frac{5}{12}:\frac{7}{4}-\frac{25}{8}:\frac{35}{6}\)
\(=\frac{5}{12}X\frac{4}{7}-\frac{25}{8}X\frac{6}{35}\)
\(=\frac{5}{21}-\frac{15}{28}\)
\(=-\frac{25}{84}\)
Tìm a đúng ko bạn,hãy áp dụng vào công thức này nhé!
-tách riêng
-tính
chúc bn hok tốt