a. - 7 - 9 = - (7 + 9) = - 16

b. - 15 - 8 = - (15 + 8) = - 23

c. - 28 - 32 = - (28 + 32) = - 60

d. - 43 - 32 = - (43 + 32) = - 75

e. - 5 - 9 - 11

= - (5 + 9 + 11)

= - (14 + 11)

= - 25

f. - 6 - 8 - 13

= - (6 + 8 + 13)

= - (14 + 13)

= - 27

g. - 3 - 7 - 25

= - (3 + 7 + 25)

= - (10 + 25)

= - 35

h. - 7 - 4 - 15

= - (7 + 4 + 15)

= - (11 + 15)

= - 26

5/7:15/28=4/3

9/11:21/22=6/7

7/9:5/6=14/15

8/15:16/25=5/6

k cho mình nhé

dung roi

a=4/3

b=6/7

c=14/15

d=5/6

a,15/8

b, 73/56

c,1/6

d,4

đúng nhé bạn

a,15/8

b, 73/56

c,1/6

d,4

3/4+1/2 +5/8 = 5/4 + 5/8 =15/8

b, 1/47/56 - 15/28= 73/ 56

c, 11/30 - 1/5 = 1/6

d tương tự nhé

5/6 + 9/12 : 18/5 = 5/6 + 3/4 : 18/5

                          = 5/6 + 3/4 x 5/18

                         = 5/6 + 15/72

                         = 5/6 + 5/24

                         = 20/24 + 5/24

                         = 25/24

5/7 + 9/8 - 15/28 = 40/56 + 63/56 - 30/56

                          = 103/56 - 30/56

                          = 73/56

\(\dfrac{5}{6}+\dfrac{9}{12}:\dfrac{18}{5}\)
\(=\dfrac{5}{6}+\dfrac{5}{24}\)
\(=\dfrac{25}{24}\)
\(---\)
\(\dfrac{5}{7}+\dfrac{9}{8}-\dfrac{15}{28}\)
\(=\dfrac{103}{56}-\dfrac{15}{28}\)
\(=\dfrac{73}{56}\)

5/6 + 9/12 : 18/5

=5/6 + 5/24

=25/24

\(\dfrac{5}{6}+\dfrac{9}{12}:\dfrac{18}{5}=\dfrac{5}{6}+\dfrac{5}{24}=\dfrac{25}{24}\)

\(\dfrac{5}{7}+\dfrac{9}{8}-\dfrac{15}{28}=\dfrac{40}{56}+\dfrac{72}{56}-\dfrac{30}{56}=\dfrac{41}{28}\)

a)\(\dfrac{-10}{11}.\dfrac{8}{9}+\dfrac{7}{18}.\dfrac{10}{11}\)

=\(\dfrac{10}{11}.\dfrac{-8}{9}+\dfrac{7}{18}.\dfrac{10}{11}\)

=\(\dfrac{10}{11}(\dfrac{-8}{9}+\dfrac{7}{18})\)

=\(\dfrac{10}{11}.\dfrac{-1}{2}\)

=\(\dfrac{-5}{11}\)

b; 

B = \(\dfrac{3}{14}\) : \(\dfrac{1}{28}\) - \(\dfrac{13}{21}\): \(\dfrac{1}{28}\) + \(\dfrac{29}{42}\) : \(\dfrac{1}{28}\) - 8

B = (\(\dfrac{3}{14}\) - \(\dfrac{13}{21}\) + \(\dfrac{29}{42}\)) - 8

B = (\(\dfrac{9}{42}\) - \(\dfrac{26}{42}\) + \(\dfrac{29}{42}\)) - 8

B = (\(\dfrac{-17}{42}\) + \(\dfrac{29}{42}\)) - 8

B = \(\dfrac{2}{7}\) - 8

B = \(\dfrac{2}{7}-\dfrac{56}{7}\)

B = - \(\dfrac{54}{7}\)

c; C = -1\(\dfrac{5}{7}\).15 + \(\dfrac{2}{7}\)(-15) + (-105).(\(\dfrac{2}{3}\) - \(\dfrac{4}{5}\) + \(\dfrac{1}{7}\))

C = - 15.(- 1 - \(\dfrac{5}{7}\) + \(\dfrac{2}{7}\) + \(\dfrac{14}{3}\) - \(\dfrac{28}{5}\) + \(1\))

C = -15.[(1 - 1) - (\(\dfrac{5}{7}\) - \(\dfrac{2}{7}\)) + \(\dfrac{14}{3}\) - \(\dfrac{28}{5}\)]

C = -15.[0 - \(\dfrac{3}{7}\) + \(\dfrac{14}{3}\) - \(\dfrac{28}{5}\)]

C = -15 . [- \(\dfrac{45}{105}\) + \(\dfrac{490}{105}\)  - \(\dfrac{588}{105}\)]

C = -15. [ \(\dfrac{445}{105}\) - \(\dfrac{588}{105}\)]

C = - 15.(- \(\dfrac{143}{105}\))

C = \(\dfrac{143}{7}\)

1+5+7+8+9+10+10+15+16+19+22+65+97+34+28-5-9-6-7-2-45-68=204

k cho mk nha

mk nhanh nhất

dai qua zay

ha bn?

ha?

nếu bạn chán quá thì cũng đừng đăng mấy câu hỏi kiểu này

a: 7/4=28/16

15/16=15/16

b: 1/8=3/24

2/3=16/24

5/2=60/24

c: 2/7=8/28

9/4=63/28

5/28=5/28

a)\(28/16 và 15/16\)

b)\(3/24; 16/24; 60/24\)

c)\(8/28; 63/28; 5/28\)nhé