tính

\(\dfrac{-5}{8}:\dfrac{15}{4}\) \(\dfrac{-15}{17}:\dfrac{25}{-34}\) \(-48:(\dfrac{-24}{5})\) \(\dfrac{-30}{7}:(\dfrac{-5}{-14})\)

\(\dfrac{15}{28}:(\dfrac{-9}{14})\) \(\dfrac{-7}{40}:(-\dfrac{21}{20})\) \((\dfrac{-4}{15}).(-\dfrac{-25}{8})\) \(\dfrac{5}{-14}.(-\dfrac{7}{10})\)

\(\dfrac{-15}{4}.(-\dfrac{16}{25})\) \(15.(-\dfrac{13}{10})\) \((-\dfrac{14}{5}).-10\) \((\dfrac{3}{-10}).(-\dfrac{-15}{2})\)

\(\dfrac{-15}{17}:\dfrac{25}{34}\)

-48:\((\dfrac{-24}{5})\)

\(\dfrac{-30}{7}\):\((\dfrac{-5}{-14})\)

\(\dfrac{15}{28}:(\dfrac{-9}{14})\)

\(\dfrac{-7}{40}:(-\dfrac{21}{20})\)

\((\dfrac{-4}{15}).(-\dfrac{-25}{8})\)

LÀM NHANH VÀ ĐÚNG CHO MÌNH NHA!!!!!!!!!!!!. LƯU Ý LÀ CẢ CÁCH LÀM NỮA NHÉ!

bài 1 : so sánh :

a) \(\dfrac{23}{21}\)và\(\dfrac{21}{23}\)

b)\(\dfrac{19}{26}\)và \(\dfrac{21}{25}\)

bài 2 : sắp sếp các phân số sau từ bé đến lớn :

a)\(\dfrac{7}{36};\dfrac{24}{36};\dfrac{13}{36};\dfrac{1}{36};\dfrac{43}{36};\dfrac{36}{36}\)

b)\(\dfrac{-3}{10};\dfrac{-31}{100};\dfrac{-297}{1000};\dfrac{10000}{-3056}\)

c)\(\dfrac{13}{20};\dfrac{7}{20};\dfrac{9}{4};\dfrac{2}{5};\dfrac{1}{2}\)

d)\(\dfrac{13}{21};\dfrac{152}{17};\dfrac{13}{17};\dfrac{-5}{21}\)

e)\(\dfrac{-1}{2};\dfrac{3}{-4};\dfrac{-2}{3};\dfrac{4}{-5}\)

Câu 1:

*LƯU Ý: dấu này"." là nhân.

a) \(57\%+1\frac{2}{15}:\frac{68}{25}-2.282\)

b) \(1\frac{13}{15}.0,75-\left(\frac{8}{15}+0,25\right).\frac{24}{47}\)

c) \(\frac{3}{4}.\frac{16}{9}-\frac{7}{5}:\frac{-21}{26}\)

d) \(5:\left(4\frac{3}{4}-1\frac{25}{28}\right)-1\frac{3}{8}:\left(\frac{3}{8}-\frac{9}{20}\right)\)

CÁC BẠN ƠI GIÚP MÌNH VOIỨ MAI MK NỘP CHO CÔ RÙI HUHU

Tìm các tích sau :

a) \(\frac{16}{15}\)\(\times\)\(\frac{-5}{14}\)\(\times\)\(\frac{54}{24}\)\(\times\)\(\frac{56}{21}\)

b) \(\frac{7}{3}\)\(\times\)\(\frac{-5}{2}\)\(\times\)\(\frac{15}{21}\)\(\times\)\(\frac{4}{-5}\)

c) \(\frac{5}{7}\)\(+\)\(\frac{5}{9}\)\(-\)\(\frac{5}{11}\)

\(\frac{15}{7}\)\(+\)\(\frac{15}{9}\)\(-\)\(\frac{15}{11}\)

d) 4 \(+\)\(\frac{4}{13}\)\(-\)\(\frac{4}{115}\)

5 \(+\)\(\frac{5}{73}\)\(-\)\(\frac{1}{23}\)

bài 1:thực hiện phép tính : 

a)\(\frac{3}{7}+\frac{5}{13}+\frac{4}{13}\)

b)\(\left(\frac{3}{8}+\frac{-3}{4}+\frac{7}{12}\right):\frac{5}{6}+\frac{1}{2}\)

c)\(\frac{2}{5}.\frac{1}{3}-\frac{2}{15}:\frac{1}{5}+\frac{3}{5}.\frac{1}{3}\)

d)\(\left(4-\frac{5}{12}\right):2+\frac{5}{24}\)

e)\(\frac{7}{19}.\frac{8}{11}+\frac{3}{11}.\frac{7}{19}+\frac{-1}{19}\)

f)\(\frac{9}{27}+\frac{8}{24}+\frac{18}{27}-\frac{-16}{24}+\frac{2}{3}\)

g)\(\frac{-5}{21}+\frac{-2}{21}+\frac{8}{24}\)

h)\(\frac{-5}{9}+\frac{8}{15}+\frac{-2}{11}+\frac{4}{-9}+\frac{7}{15}\)

i)\(\frac{7}{25}.\frac{39}{-14}.\frac{50}{78}\)

m.n làm nhanh cho mình nhé, chiều mình phải nộp rồi! cảm ơn m.n!

Thực hiện quy đồng mẫu các phân số sau:

a)\(\dfrac{2}{9}\); \(\dfrac{5}{18}\); \(\dfrac{1}{3}\) d) \(\dfrac{-4}{7}\); \(\dfrac{8}{9}\); \(\dfrac{-10}{21}\)

b) \(\dfrac{7}{15}\); \(\dfrac{1}{5}\);\(\dfrac{-5}{6}\) e) \(\dfrac{3}{-20}\); \(\dfrac{-11}{-30}\); \(\dfrac{7}{15}\)

c)\(\dfrac{-3}{16}\); \(\dfrac{5}{24}\); \(\dfrac{-21}{56}\)

1)tìm các cặp phân số bằng nhau trong các phân số sau

\(\frac{6}{-18}\), \(\frac{-3}{4}\), \(\frac{4}{10}\), \(\frac{-1}{3}\), \(\frac{1}{-2}\), \(\frac{-5}{10}\), \(\frac{8}{16}\)

2 tìm x biết 

a) \(\frac{x}{4}\)= \(\frac{21}{28}\)

b) \(\frac{2x}{5}\)= \(\frac{-24}{10}\)