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27 tháng 3 2017

a )   − 12 − 24 = ( − 12 ) : ( − 12 ) ( − 24 ) : ( − 12 ) = 1 2

b )   54 270 = 54 : 54 270 : 54 = 1 5

c )   − 12 − 28 = ( − 12 ) : ( − 4 ) ( − 28 ) : ( − 4 ) = 3 7

15 tháng 2 2019

c ) − 5 15 = ( − 5 ) : 5 15 : 5 = − 1 2 d ) − 12 − 24 = ( − 12 ) : ( − 12 ) ( − 24 ) : ( − 12 ) = 1 2

e ) 54 270 = 54 : 54 270 : 54 = 1 5 f ) − 12 − 28 = ( − 12 ) : ( − 4 ) ( − 28 ) : ( − 4 ) = 3 7

g ) − 18 − 27 = ( − 18 ) : ( − 9 ) ( − 27 ) : ( − 9 ) = 2 3 h ) 45 − 24 = 45 : ( − 3 ) ( − 24 ) : ( − 3 ) = − 15 8

23 tháng 3 2021

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a) \(\dfrac{11\cdot8-11\cdot3}{17-6}\)

\(=\dfrac{11\cdot\left(8-3\right)}{11}=5\)

b) \(\dfrac{24-12\cdot13}{12+4\cdot9}\)

\(=\dfrac{12\cdot\left(2-13\right)}{12\left(1+3\right)}=\dfrac{-11}{4}\)

a: \(=\dfrac{13\cdot\left(9-2\right)}{13}=7\)

b: \(=\dfrac{14\left(3-8\right)}{7\left(1+3\cdot3\right)}=2\cdot\dfrac{-5}{10}=-1\)

c: \(=\dfrac{54-72}{36}=\dfrac{-18}{36}=-\dfrac{1}{2}\)

d: \(=\dfrac{5^3}{10^2\cdot5}=\dfrac{5^2}{100}=\dfrac{1}{4}\)

a: 12/21=4/7=8/14

4/56=1/14

b: 12/15=4/5=24/30

6/36=1/6=5/30

15/50=3/10=9/30

c: 63/77=9/11=81/99

60/108=5/9=55/99

-18/27=-2/3=-66/99

d: -26/-156=1/6=7/42

49/-14=-7/2=-147/42

32/112=2/7=12/42

Ta có: \(A=\dfrac{3469-54}{6938-108}\)

\(=\dfrac{3469-54}{2\left(3469-54\right)}=\dfrac{1}{2}\)

\(=\dfrac{3}{6}\)

Ta có: \(B=\dfrac{2468-98}{3702-147}\)

\(=\dfrac{2\left(1234-49\right)}{3\left(1234-49\right)}=\dfrac{2}{3}\)

\(=\dfrac{4}{6}\)

17 tháng 12 2021

\(\dfrac{-270}{450}=\dfrac{-9}{15}\)
\(\dfrac{11}{-143}=\dfrac{1}{-13}\)
\(\dfrac{32}{12}=\dfrac{8}{3}\)
\(\dfrac{-26}{-156}=\dfrac{1}{6}\)

13 tháng 8 2015

6/9=2/3

6/14=1/4

12/24=1/2

6/14=3/7

6/9=6:3/9:3=2/3

6/24=6:6/24:6=1/4

12/24=12:12/24:12=1/2

6/14=6:2/14:2=3/7

1 tháng 1 2019

a ) 1 3 b ) 1 4 c ) − 1 3

d ) 1 2 e ) 1 4 f ) 3 5

g ) 2 3 h ) − 3 2