bốn phần năm trừ mười một phần năm
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\(\frac{4}{7}-\frac{2}{15}\div\frac{4}{25}\)
\(=\frac{4}{7}-\frac{2}{15}\times\frac{25}{4}\)
\(=\frac{4}{7}-\frac{50}{60}\)
\(=\frac{4}{7}-\frac{5}{6}\)
\(=\frac{24}{42}-\frac{35}{42}\)
\(=-\frac{11}{42}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{4}{5}\cdot\frac{3}{7}+\frac{4}{5}\cdot\frac{6}{7}-\frac{4}{5}\cdot\frac{4}{14}\)
\(=\frac{4}{5}\cdot\left(\frac{3}{7}+\frac{6}{7}-\frac{4}{14}\right)\)
\(=\frac{4}{5}\cdot1=\frac{4}{5}\)
#Louis
![](https://rs.olm.vn/images/avt/0.png?1311)
4/5 x 3/4 - 3/10
= 12/20 - 3/10
= 12/20 - 6/20
= 6/20
= 3/10
![](https://rs.olm.vn/images/avt/0.png?1311)
a; 0,2.\(\dfrac{15}{36}\) - (\(\dfrac{2}{5}\) + \(\dfrac{2}{3}\)): 1%
= \(\dfrac{1}{12}\) - \(\dfrac{16}{15}\): \(\dfrac{1}{100}\)
= \(\dfrac{1}{12}\) - \(\dfrac{320}{3}\)
= \(\dfrac{1}{12}\) - \(\dfrac{1280}{12}\)
= - \(\dfrac{1279}{12}\)
b; 75% - 1\(\dfrac{1}{2}\) + 0,5 : \(\dfrac{5}{12}\)
= 0,75 - 1,5 + 1,2
= -0,75 + 1,2
= 0,45
c; 1\(\dfrac{3}{15}.0,75-\left(\dfrac{8}{15}+0,25\right)\).\(\dfrac{24}{47}\)
= \(\dfrac{28}{15}\).0,75 - \(\dfrac{47}{60}\).\(\dfrac{24}{47}\)
= \(\dfrac{7}{5}-\dfrac{2}{5}\)
= 1
d; \(\dfrac{32}{15}\): (-1\(\dfrac{1}{5}\) + 1\(\dfrac{1}{3}\))
= \(\dfrac{32}{15}\): (-\(\dfrac{6}{5}\) + \(\dfrac{4}{3}\))
= \(\dfrac{32}{15}\): \(\dfrac{2}{15}\)
= 16
![](https://rs.olm.vn/images/avt/0.png?1311)
a; \(\dfrac{3}{5}\) - \(\dfrac{-7}{10}\) - \(\dfrac{13}{-20}\)
= \(\dfrac{12}{20}\) + \(\dfrac{14}{20}\) + \(\dfrac{13}{20}\)
= \(\dfrac{39}{20}\)
b; \(\dfrac{1}{2}\) + \(\dfrac{1}{-3}\) + \(\dfrac{1}{4}\) - \(\dfrac{-1}{6}\)
= \(\dfrac{6}{12}\) - \(\dfrac{4}{12}\) + \(\dfrac{3}{12}\) + \(\dfrac{2}{12}\)
= \(\dfrac{7}{12}\)
4/5 - 11/5
= -7/5
lớp 4 chưa học số âm nhé , bn xem lại đề
\(\dfrac{4}{5}\) - \(\dfrac{11}{5}\)
= - \(\dfrac{7}{5}\) (lớp 4 chưa học âm)