Đáp số : 11/5

Ủng hộ nhé ! 

= 11/5 nha bn

132/60

mk

50+[30-2.(14-48:4²)]

=50 + [30 -2.(14 - 48:16)]

=50 + [30 -2 .(14 - 3)]

=50 +[30 -2.11]

=50+[30-22]

=50 + 8

=58

-41/28

-7/30

47/20

-11/8

1/2

31/72

-40/39

1/2 + 1/3 + 1/4 = 6/12 + 4/12 + 3/12 = 13/12

2/3 + 3/4 + 4/5 = 8/12 + 9/12 + 4/5 = 17/12 + 4/5 = 85 / 60 +  48 / 60 = 133/ 60

6/5 + 4/3 + 7/9 = 18/ 15 + 20/15 + 7/9 = 38 /15 + 7/ 9 = 114/45 +35/45 = 149/45

8/9 - 5/6 = 16/18 - 15/18 = 1/18 

15/17 - 11 /13 = 195/221 -187/221= 8/221

a) \(\frac{1}{2}+\frac{1}{3}+\frac{1}{4}\)

= \(\frac{6}{12}+\frac{4}{12}+\frac{3}{12}\)

= \(\frac{13}{12}\).

b) \(\frac{2}{3}+\frac{3}{4}+\frac{4}{5}\)

= \(\frac{8}{12}+\frac{9}{12}+\frac{4}{5}\)

= \(\frac{17}{12}+\frac{4}{5}\)

= \(\frac{85}{60}+\frac{48}{60}\)

= \(\frac{133}{60}\).

c)\(\frac{6}{5}+\frac{4}{3}+\frac{7}{9}\)

= \(\frac{54}{45}+\frac{62}{45}+\frac{35}{45}\)

= \(\frac{151}{45}\).

d) \(\frac{8}{9}-\frac{5}{6}\)

= \(\frac{16}{18}-\frac{15}{18}\)

= \(\frac{1}{18}\).

e) \(\frac{15}{17}-\frac{11}{13}\)

= \(\frac{195}{221}\)\(-\frac{187}{221}\)

= \(\frac{8}{221}\).

Trả lời:

\(a)\)\(2\frac{3}{5}-\frac{4}{10}\)\(=\frac{13}{5}-\frac{2}{5}\)\(=\frac{11}{5}\)

\(b)\)\(\frac{18}{81}\div\frac{150}{135}\)\(=\frac{18}{81}\times\frac{135}{150}\)\(=\frac{1}{5}\)

\(c)\)\(3\frac{5}{6}\div2\frac{2}{3}\)\(=\frac{23}{6}\div\frac{8}{3}\)\(=\frac{23}{6}\times\frac{3}{8}\)\(=\frac{23}{16}\)

Hok tốt!

Vuong Dong Yet

a. \(\frac{3}{4}>\frac{2}{4}\)

b. \(\frac{3}{8}< \frac{7}{8}\)

c . \(\frac{8}{10}< \frac{9}{10}\)

a, 3/4>2/4

b, 3/8 < 7/8

c, 8/10 > 9/10