K
Khách

Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.

Cách 1:
\(\frac{4}{7}:\frac{13}{24}+\frac{5}{7}:\frac{13}{24}\)
=( \(\frac{4}{7}+\frac{5}{7}\)):\(\frac{13}{24}\)
\(\frac{9}{7}:\frac{13}{24}=\frac{216}{91}\)
Cách 2:
\(\frac{4}{7}:\frac{13}{24}+\frac{5}{7}:\frac{13}{24}=\frac{96}{91}+\frac{120}{91}=\frac{216}{91}\)

1 tháng 11 2023

a là 39

6 tháng 8 2019

\(\frac{2}{7}:\frac{13}{24}+\frac{2}{7}:\frac{5}{24}\)

\(=\frac{2}{7}x\frac{24}{13}+\frac{2}{7}x\frac{14}{5}=\frac{2}{13}x\frac{24}{7}+\frac{2}{5}x\frac{24}{7}\)

\(=\frac{24}{7}x\left(\frac{2}{13}+\frac{2}{5}\right)=\frac{24}{7}x\frac{36}{65}=\frac{864}{455}\)

6 tháng 8 2019

=48/91+48/35

=864/455

   study well

  k nha

  mk xin cảm ơn mọi người

a)<=>2/7:(13/24+5/24)   b)<=>15/24-9/24-4/24       c)=7.5.39/13.14.15

<=>2/7:3/4                        <=>2/24=1/12                      =3/2.3

<=>2/7x4/3                                                                    =1/2

<=>8/21                                     

4 tháng 8 2019

a. \(\frac{2}{7}:\frac{13}{24}+\frac{2}{7}:\frac{5}{24}\)

\(\frac{2}{7}:\left(\frac{13}{24}+\frac{5}{24}\right)\)

\(\frac{2}{7}:\frac{3}{4}\)

\(\frac{8}{21}\)

b. \(\frac{15}{24}-\frac{3}{8}-\frac{1}{6}\)

\(\frac{15}{24}-\frac{9}{24}-\frac{4}{24}\)

\(\frac{2}{24}=\frac{1}{12}\)

c. \(\frac{7}{13}.\frac{5}{14}.\frac{39}{15}\)

\(\frac{7.5.3.13}{13.2.7.3.5}\)

\(\frac{1}{2}\)

8 tháng 9 2020

a, =4/18+5/13+7/9+21/13

=4/18+5/13+14/18+21/13

=[4/18+14/18]+ [5/13+21/13]

=1+1/2

=3/2

8 tháng 9 2020

b,=[4/3-2/3]+[5/7-2/7]

=2/3+5/7=14/21+15/21

=29/21

a) 12/17 + 21/25 = 657/425

b) 4 - 205/811 = 3039/811

c) 12 . 21/25 = 252/25

d) 4 : 205/811 =  205/3244

31 tháng 8 2021

a) 12/17 + 21/25 = 657/425

b) 4 - 205/811 = 3039/811

c) 12 . 21/25 = 252/25

d) 4 : 205/811 = 205/3244

26 tháng 7 2023

\(a.\dfrac{7}{19}+\dfrac{12}{19}=\dfrac{7+12}{19}=\dfrac{19}{19}=1\)

\(b.\dfrac{5}{13}+\dfrac{4}{13}=\dfrac{5+4}{13}=\dfrac{9}{13}\)

\(c.\dfrac{24}{11}-\dfrac{13}{11}=\dfrac{24-13}{11}=\dfrac{11}{11}=1\)

\(d.\dfrac{35}{8}-\dfrac{19}{8}=\dfrac{35-19}{8}=\dfrac{16}{8}=2\)

26 tháng 7 2023

a,\(\dfrac{7}{19}\)+\(\dfrac{12}{19}\)=\(\dfrac{19}{19}\)=1

b,\(\dfrac{5}{13}\)+\(\dfrac{4}{13}\)=\(\dfrac{9}{13}\)

c,\(\dfrac{24}{11}\)-\(\dfrac{13}{11}\)=\(\dfrac{11}{11}\)=1

d,\(\dfrac{35}{8}\)-\(\dfrac{19}{8}\)=\(\dfrac{16}{8}\)=2

22 tháng 10 2019

a)=(3/8+10/16)+(7/12+10/24)

=1+1=2

c)=(4/6+14/6)+(7/13+19/13)+(17/9+1/9)

=3+2+2=7

\(\dfrac{15}{24}-\dfrac{3}{8}-\dfrac{1}{6}=\dfrac{5}{8}-\dfrac{3}{8}-\dfrac{1}{6}=\dfrac{1}{4}-\dfrac{1}{6}=\dfrac{1}{12}\)

\(\dfrac{7}{13}\cdot\dfrac{5}{24}\cdot\dfrac{39}{75}=\dfrac{39}{13}\cdot\dfrac{5}{75}\cdot\dfrac{7}{24}=3\cdot\dfrac{1}{15}\cdot\dfrac{7}{24}=\dfrac{35}{24}\)

25 tháng 7 2021

`15/24-3/8-1/6`

`=15/24-9/24-4/24`

`=2/24`

`=1/12

d, `7/13 . 5/24 . 39/75`

`=(7.5.13.3)/(13.24.5.5.3)`

`=7/(24.5)`

`=7/120`

10 tháng 9 2017

2222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222225444444455555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555

10 tháng 9 2017

\(\frac{4}{18}+\frac{5}{13}+\frac{7}{9}+\frac{21}{13}\)

\(\left(\frac{4}{18}+\frac{7}{9}\right)+\left(\frac{5}{13}+\frac{21}{13}\right)\)

\(1+2\)

\(3\)

\(\frac{4}{3}-\frac{2}{7}-\frac{5}{7}+\frac{2}{3}\)

\(\left(\frac{4}{3}-\frac{2}{3}\right)-\left(\frac{2}{7}+\frac{5}{7}\right)\)

\(\frac{2}{3}-1\)

\(-\frac{1}{3}\)