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2 tháng 3 2015

a=3

b=2

c=0

14 tháng 1 2018

BÀI 1:

a)    \(\frac{4}{5}+\frac{3}{8}+\frac{1}{4}\)

\(=\frac{32}{40}+\frac{15}{40}+\frac{10}{40}\)

\(=\frac{32+15+10}{40}\)\(=\frac{57}{40}\)

b)    \(\frac{5}{9}+\frac{2}{3}+\frac{1}{2}\)

\(=\frac{10}{18}+\frac{12}{18}+\frac{9}{18}\)

\(=\frac{10+12+9}{18}=\frac{31}{18}\)

14 tháng 1 2018

bài 23,, 5 nữa

25 tháng 9 2017

a. 3/5 -1/5 x 10/13

    = 3/5 - 2/13

    = 29/65

b. 1/2 + 3/8 : 3/4

     = 1/2 + 1/2

     = 1

c. (3/5 - 3/20) x4/5

     = 9/20 x 4/5

     = 9/25

25 tháng 9 2017

\(a,\frac{3}{5}-\frac{1}{15}x\frac{10}{13}\)

=3/5-2/39

=107/195

b,1/2+3/8:3/4

=1/2+1/2

=1

c,(3/5-3/20)x4/5

=9/20x4/5

=9/25

22 tháng 3 2023

\(a,\dfrac{1}{3}+\dfrac{3}{4}\times\dfrac{2}{9}=\dfrac{1}{3}+\dfrac{6}{36}=\dfrac{1}{3}+\dfrac{1}{6}=\dfrac{2}{6}+\dfrac{1}{6}=\dfrac{3}{6}=\dfrac{1}{2}\)

\(b,2-\left(\dfrac{2}{5}+\dfrac{2}{3}\right)=2-\left(\dfrac{6}{15}+\dfrac{10}{15}\right)=2-\dfrac{16}{15}=\dfrac{30}{15}-\dfrac{16}{15}=\dfrac{14}{15}\)

\(c,\dfrac{2}{5}:\dfrac{4}{7}+\dfrac{1}{3}=\dfrac{2}{5}\times\dfrac{7}{4}+\dfrac{1}{3}=\dfrac{14}{20}+\dfrac{1}{3}=\dfrac{7}{10}+\dfrac{1}{3}=\dfrac{21}{30}+\dfrac{10}{30}=\dfrac{31}{30}\)

\(d,\dfrac{9}{13}:\dfrac{3}{26}-\dfrac{8}{13}=\dfrac{9}{13}\times\dfrac{26}{3}-\dfrac{8}{13}=\dfrac{234}{39}-\dfrac{8}{13}=6-\dfrac{8}{13}=\dfrac{78}{13}-\dfrac{8}{13}=\dfrac{70}{13}\)

a:=1/3+6/36

=1/3+1/6

=1/2

b: =2-16/15

=14/15

c: =2/5*7/4+1/3

=14/20+1/3

=7/10+1/3

=21/30+10/30=31/30

d: =9/13*26/3-8/13

=3-8/13=31/13

11 tháng 5 2022

a,3+5/2=11/2

b,2/8:4/8=1/2

c,13/5-2=3/5

d,1/2.3/5=3/10

11 tháng 5 2022

`a)`

`3+5/2 = 6/2 + 5/2 = 11/2`

`b)`

`2/8 : 4/8 = 1/4 : 1/2 = 1/4 *2=1/2`

`c)`

`13/5 - 2 = 13/5 - 10/5 = 3/5`

`d)`

`1/2 xx 2/5 = 1/5`

15 tháng 4 2022

a)\(=\dfrac{16}{13}-\dfrac{3}{15}+\dfrac{6}{13}=\dfrac{22}{13}-\dfrac{3}{15}=\dfrac{96}{65}\)

b)\(=\dfrac{21}{8}-\left(\dfrac{5}{10}+\dfrac{6}{10}\right)=\dfrac{21}{8}-\dfrac{11}{10}=\dfrac{61}{40}\)

c)\(=\dfrac{27}{10}-3-\dfrac{4}{7}--\dfrac{61}{70}\)

15 tháng 4 2022

d)\(=\dfrac{576}{702}=\dfrac{4}{5}\)

e)\(=\left(\dfrac{20}{15}-\dfrac{12}{15}\right)\times\dfrac{25}{2}=\dfrac{8}{15}\times\dfrac{25}{2}=\dfrac{20}{3}\)

f)\(=\dfrac{24}{12}-\dfrac{4}{12}-\dfrac{6}{12}-\dfrac{2}{12}-\dfrac{3}{12}=\dfrac{9}{12}=\dfrac{3}{4}\)

a)\(\frac{19}{15}\)

b) 2,625

c)\(\frac{7}{24}\)

d) 3,6

2 tháng 3 2019

a) \(\frac{7}{15}+\frac{4}{5}=\frac{7}{15}+\frac{12}{15}=\frac{19}{15}\)

b) \(\frac{5}{8}+2=\frac{5}{8}+\frac{2}{1}=\frac{5}{8}+\frac{16}{8}=\frac{21}{8}\)

c) \(\frac{2}{3}-\frac{3}{8}=\frac{16}{24}-\frac{9}{24}=\frac{7}{24}\)

d) \(4-\frac{2}{5}=\frac{4}{1}-\frac{2}{5}=\frac{20}{5}-\frac{2}{5}=\frac{18}{5}\)

27 tháng 2 2023

`a, 4/9 + 2/5 + 5/9= (4/9 +5/9) + 2/5= 1 + 2/5= 5/5 + 2/5= 7/5`

`b, 6/13 + 5/8 + 7/13=(6/13 + 7/13) + 5/8=1+5/8= 8/8 + 5/8= 13/8`

`c, 5/11 + 6/25 + 66/121 = ( 5/11 + 66/121 ) + 6/25=1 + 6/25 = 25/25 + 6/25 = 31/25`

`d, 1/2 + 1/3 + 1/4 + 1/6 + 1/12 + 1/24= (1/2 + 1/4) +(1/3 + 1/6) + (1/12 + 1/24)= 3/4 + 1/2 + 1/8=  6/8 + 4/8 + 1/8= 11/8`

`@ yl`

24 tháng 8 2023

a) \(\dfrac{2}{7}+\dfrac{4}{7}=\dfrac{2+4}{7}=\dfrac{6}{7}\)

b) \(\dfrac{23}{13}+\dfrac{8}{13}=\dfrac{23+8}{13}=\dfrac{31}{13}\)

c) \(\dfrac{27}{125}+\dfrac{16}{125}=\dfrac{27+16}{125}=\dfrac{43}{125}\)

24 tháng 8 2023

a)\(\dfrac{2}{7}\) + \(\dfrac{4}{7}\) =  \(\dfrac{6}{7}\)  

b)\(\dfrac{23}{13}\) + \(\dfrac{8}{13}\) = \(\dfrac{31}{13}\)          

c)\(\dfrac{27}{125}\) + \(\dfrac{16}{125}\) = \(\dfrac{43}{125}\)

24 tháng 3 2022

a) \(3+\dfrac{5}{2}=\dfrac{6}{2}+\dfrac{5}{2}=\dfrac{11}{2}\)

b) \(\dfrac{2}{8}:\dfrac{4}{8}=\dfrac{2}{8}.\dfrac{8}{4}=\dfrac{2}{4}=\dfrac{1}{2}\)

c) \(\dfrac{13}{5}-2=\dfrac{26}{10}-\dfrac{20}{10}=\dfrac{6}{10}=\dfrac{3}{5}\)

24 tháng 3 2022

a)\(=\dfrac{6}{2}+\dfrac{5}{2}=\dfrac{11}{2}\)

b)\(=\dfrac{2}{8}\cdot\dfrac{8}{4}=\dfrac{2}{4}=\dfrac{1}{2}\)

c)\(=\dfrac{13}{5}-\dfrac{10}{5}=\dfrac{3}{5}\)