3*7*8*13/14*15*26

=3*7*8*13/2*7*3*5*2*13

=8/2

=4

k mik zới

tối giản rồi em nhé 

Phân số này đã tối giản r

- 26 - 156 = - 26 : ( - 26 ) - 156 : ( - 26 ) = 1 6

\(\dfrac{26:13}{39:13}=\dfrac{2}{3}\)

2/3

\(\dfrac{26}{39}=\dfrac{26:13}{39:13}=\dfrac{2}{3}\)

`(21.6-21)/(5-26)`

`= (21.5)/(-21)`

`= -5`.

`(21.6-21)/(5-26)`

`=(126-21)/(-21)`

`= 105/(-21)`

`=-5`

\(\dfrac{26}{39}=\dfrac{26:13}{39:13}=\dfrac{2}{3}\)
\(\dfrac{38}{57}=\dfrac{38:19}{57:19}=\dfrac{2}{3}\)

\(\dfrac{26}{39}=\dfrac{26:13}{39:13}=\dfrac{2}{3}\)

\(\dfrac{38}{57}=\dfrac{38:19}{57:19}=\dfrac{2}{3}\)

`26/39=(26:13)/(39:13)=2/3`

`38/57=(38:19)/(57:19)=2/3`

\(\dfrac{-1}{13}\)

\(\dfrac{3}{5}\)

\(\dfrac{1}{6}\)

\(\dfrac{8}{13};3;\dfrac{24}{43};\dfrac{16}{13}\)

\(\dfrac{16}{26}=\dfrac{8}{13};\dfrac{36}{12}=3;\dfrac{48}{86}=\dfrac{16}{13};\dfrac{80}{65}=\dfrac{16}{13}\)

a)  − 270 450 = − 3 .90 5.90 = − 3 5

b)  11 − 143 = 11 − 13 .11 = 1 − 13

c)  − 26 − 156 = − 26 − 26 .6 = 1 6