\(\left(\dfrac{-5}{28}+1,75+\dfrac{8}{35}\right)\):\(\left(\dfrac{-39}{20}\right)\)

=\(\left(\dfrac{-5}{28}+\dfrac{7}{4}+\dfrac{8}{35}\right):\left(\dfrac{-39}{20}\right)\)

=\(\left(\dfrac{11}{7}+\dfrac{8}{35}\right):\left(\dfrac{-39}{20}\right)\)

=\(\dfrac{9}{5}:\left(\dfrac{-39}{20}\right)\)

=\(\dfrac{9.\left(-20\right)}{5.39}\)

=\(\dfrac{3.\left(-4\right)}{1.13}\)

=\(\dfrac{-12}{13}\)

Hỗn số thì đi mà làm .

Ai rảnh hơi🖕🏻

(\(-\frac{5}{28}+1,75+\frac{8}{35}\)) : (\(-3\frac{9}{20}\))

= \(\frac{9}{5}\) : \(-\frac{39}{10}\)

= \(-\frac{6}{13}\)

cậu tính hẳn ra đi

Ta có : ( -5/28 + 7/4 + 8/35 ) : ( -69/20 ) .

    = ( -25/140 + 245/140 + 32/140 ) * ( -20/69 ) .

    = 9/5 * ( -20/69 ) .

    = -12/23 .

= -12/23

các bạn nhớ trình bày rõ ràng các bước luôn nha

câu đố:

có một con chim đậu trên cành 2con khác bay  đến đậu.Hỏi trên cành có bao nhiêu con chim?

\(\left(\frac{-5}{28}+1,75+\frac{8}{35}\right):\left(-3\frac{9}{20}\right)\)

\(=1,8:\left(-3\frac{9}{20}\right)\)

\(=\frac{-12}{23}\)

agelina jolie....mấy dạng bài này dễ mà,..nếu ko bt lm thj sử dụng máy tính,có j mà ko lm đc

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) \(70,5-528:\dfrac{15}{2}\)

\(=70,5-528.\dfrac{2}{15}\)

\(=70,5-\dfrac{1056}{15}\)

\(=70,5-70,4\)

\(=0,1\)

mình chỉ làm được câu đầu tiên thôi

rồi cậu làm tiếp nhé!!!!!!!!!!!!

=\(\frac{1}{2}.\left(\frac{42}{189}+\frac{81}{189}-\frac{35}{189}\right)\)

\(\left(\frac{-5}{28}+1,75+\frac{8}{35}\right)\div\left(\frac{-39}{20}\right)\)

\(=\left(\frac{-5}{28}+\frac{7}{4}+\frac{8}{35}\right)\div\left(\frac{-39}{20}\right)\)

\(=\left(\frac{11}{7}+\frac{8}{35}\right)\div\left(\frac{-39}{20}\right)\)

\(=\frac{9}{5}\div\left(\frac{-39}{20}\right)\)

\(=\frac{9.\left(-20\right)}{5.39}\)

\(=\frac{3.\left(-4\right)}{1.13}\)

\(=\frac{-12}{13}\)

70,5-528:15/2