Tham khảo:

\(\dfrac{4}{7}-\dfrac{1}{3}< \dfrac{1}{2}-\dfrac{2}{9}\)

\(\dfrac{125}{100}-\dfrac{48}{64}< \dfrac{6}{7}-\dfrac{14}{28}\)

\(\dfrac{7}{5}-\dfrac{22}{25}=\dfrac{1}{5}+\dfrac{4}{10}\)\(\dfrac{45}{75}+\dfrac{22}{33}>\dfrac{4}{5}+\dfrac{4}{6}\)

a)\(8-\frac{3}{5}=\frac{40}{5}-\frac{3}{5}=\frac{37}{5}\)

b)\(\frac{24}{15}\times\frac{56}{72}\times\frac{10}{14}=\frac{13440}{15120}=\frac{8}{9}\)

c)\(\frac{32}{48}\times\frac{35}{21}\times\frac{63}{14}\times\frac{9}{30}=\frac{2}{3}\times\frac{5}{3}\times\frac{9}{2}\times\frac{3}{10}=\frac{270}{180}=\frac{3}{2}\)

d)\(7-\frac{72}{48}\times\frac{56}{60}-3=7-\frac{3}{2}\times\frac{14}{15}-3\)

\(=7-\frac{7}{5}-3\)

\(=\frac{35}{5}-\frac{7}{5}-\frac{15}{5}\)

\(=\frac{13}{5}\)

#H

(Sai thì sửa)

 \(\frac{4}{7}-\frac{1}{3}< \frac{1}{2}-\frac{2}{9}\)

\(\frac{125}{100}-\frac{48}{64}< \frac{6}{7}-\frac{14}{28}\)

\(\frac{7}{5}-\frac{20}{25}=\frac{1}{5}+\frac{4}{10}\)

\(\frac{45}{75}+\frac{22}{33}>\frac{4}{5}+\frac{4}{6}\)

#H

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\(a.\dfrac{3\times4\times7}{12\times8\times9}=\dfrac{3\times4\times7}{3\times4\times4\times2\times9}\\ =\dfrac{7}{4\times2\times9}=\dfrac{7}{72}\\ b.\dfrac{4\times5\times6}{12\times10\times8}=\dfrac{4\times5\times2\times3}{4\times3\times5\times2\times4\times2}=\dfrac{1}{8}\\ c.\dfrac{5\times6\times7}{12\times14\times15}=\dfrac{5\times6\times7}{2\times6\times7\times2\times5\times3}\\ =\dfrac{1}{2\times2\times3}=\dfrac{1}{12}\)

25x4+75x+7x25/5-10+15-20+25-30+35-40+45=2720

Giúpppp mìnhh vớiiiiiiiiiiiiiiiiiiiiiiiii nhanhhhhhhhhhhh lênnnnnnnnnnnnnnnnn

Nhanh rồi mình tích cho

562 HT

😒😒😒

a ) -33/56

b )-17/63

c ) 18/5

a ) - 33/56

b ) - 17/63

c ) 18/5

2 x 4 x 6 x 8 x 50 x 25 x 125 =6000000