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![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(\dfrac{-5}{28}+1,75+\dfrac{8}{35}\right)\):\(\left(\dfrac{-39}{20}\right)\)
=\(\left(\dfrac{-5}{28}+\dfrac{7}{4}+\dfrac{8}{35}\right):\left(\dfrac{-39}{20}\right)\)
=\(\left(\dfrac{11}{7}+\dfrac{8}{35}\right):\left(\dfrac{-39}{20}\right)\)
=\(\dfrac{9}{5}:\left(\dfrac{-39}{20}\right)\)
=\(\dfrac{9.\left(-20\right)}{5.39}\)
=\(\dfrac{3.\left(-4\right)}{1.13}\)
=\(\dfrac{-12}{13}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
(\(-\frac{5}{28}+1,75+\frac{8}{35}\)) : (\(-3\frac{9}{20}\))
= \(\frac{9}{5}\) : \(-\frac{39}{10}\)
= \(-\frac{6}{13}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có : ( -5/28 + 7/4 + 8/35 ) : ( -69/20 ) .
= ( -25/140 + 245/140 + 32/140 ) * ( -20/69 ) .
= 9/5 * ( -20/69 ) .
= -12/23 .
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
câu đố:
có một con chim đậu trên cành 2con khác bay đến đậu.Hỏi trên cành có bao nhiêu con chim?
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(\frac{-5}{28}+1,75+\frac{8}{35}\right):\left(-3\frac{9}{20}\right)\)
\(=1,8:\left(-3\frac{9}{20}\right)\)
\(=\frac{-12}{23}\)
agelina jolie....mấy dạng bài này dễ mà,..nếu ko bt lm thj sử dụng máy tính,có j mà ko lm đc
![](https://rs.olm.vn/images/avt/0.png?1311)
Giải:
a) \(\left(-\dfrac{5}{28}+1,75+\dfrac{8}{35}\right):\left(\dfrac{-39}{20}\right)\)
\(=\left(-\dfrac{5}{28}+\dfrac{7}{4}+\dfrac{8}{35}\right):\left(\dfrac{-39}{20}\right)\)
\(=\left(\dfrac{11}{7}+\dfrac{8}{35}\right):\left(-\dfrac{39}{20}\right)\)
\(=\dfrac{9}{5}:\left(-\dfrac{39}{20}\right)\)
\(=\dfrac{9.\left(-20\right)}{5.39}\)
\(=\dfrac{3.\left(-4\right)}{1.13}\)
\(=\dfrac{-12}{13}\)
b) \(6\dfrac{5}{12}:2\dfrac{3}{4}+11\dfrac{1}{4}.\left(\dfrac{1}{3}+\dfrac{1}{5}\right)\)
\(=\dfrac{77}{22}:\dfrac{11}{4}+\dfrac{42}{4}.\left(\dfrac{1}{3}+\dfrac{1}{5}\right)\)
\(=\dfrac{77}{22}.\dfrac{4}{11}+\dfrac{42}{4}.\left(\dfrac{5}{15}+\dfrac{3}{15}\right)\)
\(=\dfrac{7}{3}+\dfrac{42}{4}.\dfrac{8}{15}\)
\(=\dfrac{7}{3}+\dfrac{14.2}{1.3}\)
\(=\dfrac{7}{3}+\dfrac{28}{3}\)
\(=\dfrac{35}{3}\)
c) \(70,5-528:\dfrac{15}{2}\)
\(=70,5-528.\dfrac{2}{15}\)
\(=70,5-\dfrac{1056}{15}\)
\(=70,5-70,4\)
\(=0,1\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(\frac{-5}{28}+1,75+\frac{8}{35}\right)\div\left(\frac{-39}{20}\right)\)
\(=\left(\frac{-5}{28}+\frac{7}{4}+\frac{8}{35}\right)\div\left(\frac{-39}{20}\right)\)
\(=\left(\frac{11}{7}+\frac{8}{35}\right)\div\left(\frac{-39}{20}\right)\)
\(=\frac{9}{5}\div\left(\frac{-39}{20}\right)\)
\(=\frac{9.\left(-20\right)}{5.39}\)
\(=\frac{3.\left(-4\right)}{1.13}\)
\(=\frac{-12}{13}\)
=(-5/28+7/4+8/35):(-69)/20
=(-25/140+245/140+32/140)x(-20)/69
=252/140x(-20)/69
=-12/23
ý mình là hỗn số á !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!