= 1,025641025641026  

-Tk cho mk nha-

   -Mk cảm ơn-

Lô bạn

85/39 +4/6+7/39

<=> ( 85/39 +7/39) +4/6

<=> 92/39 +4/6 

=> 118/39

Học tốt

49 . ( 1153 - 39 ) - 39 . ( 1153 - 49 )

= 49 . 1153 - 49 . 39 - 39 . 1153 + 39 . 49

= 49 . 39 - 49 . 39 + 49 . 1153 - 39 . 1153

= 0 + 1153 ( 49 - 39 )

= 1153 . 10

= 11530

49.(1153-39)-39.(1153-49)

=49.1153-49.39-39.1153+39.49

=49.1153-39.1153

=1153.(49-39)

=1153.10

=11530

a: \(=\dfrac{8\cdot4\cdot6\cdot5}{8\cdot4\cdot6\cdot3}=\dfrac{5}{3}\)

b: \(=\dfrac{9\cdot5\cdot6\cdot8}{4\cdot6\cdot5\cdot9}=\dfrac{8}{4}=2\)

c: \(=\dfrac{5\cdot4\cdot3\cdot9}{5\cdot7\cdot9}=\dfrac{4\cdot3}{7}=\dfrac{12}{7}\)

d: \(=\dfrac{7\cdot5\cdot9\cdot11}{7\cdot5\cdot27\cdot11}=\dfrac{9}{27}=\dfrac{1}{3}\)

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53 x 39 + 47 x 39 - 53 x 21 - 47 x 21

= 39 x ( 53 + 47 ) - 21 x ( 53 + 47 ) 

= 39 x 100 - 21 x 100

= 100 x ( 39 - 21 )

= 100 x 18

= 1800

53 x 39 + 47 x 39 - 53 x 21 - 47 x 21

= 39 x ( 53 + 47 ) - 21 x ( 53 + 47 )

= 39 x 100 - 21 x 100

= 100 x ( 39 - 21 )

= 100 x 18

= 1800

ai k mik k lai

53 x 39 + 47 x 39 - 53 x 21 - 47 x 21

= 39 x ( 53 + 47 ) - 21 x ( 53 + 47 ) 

= 39 x 100 - 21 x 100

= 100 x ( 39 - 21 )

= 100 x 18

= 1800

53 .39 + 47 . 39 - 53 . 21 - 47 .21

= (53 + 47) . 39 - (53 + 47) . 21

= 100 . 39 - 100 . 21

= 100 . (39 - 21)

= 100 . 18

= 1800

53 . 39 + 47 . 39-53 .21 - 47 . 21

= 39. (53 + 47 ) - 21. ( 53 -47)

=39 . 100 - 21 . 6

= 3900 -126

=3774

\(53.39+47.39-53.21-47.21\)

\(=39.\left(47+53\right)-\left(53-47\right).21\)

\(=39.100-6.21\)

\(=3.13.100-2.3.21\)

\(=3.\left(1300-42\right)\)

\(=3.1258\)

\(=3774\)

( 768 – 39 ) – 768

= ( 768 – 768 ) – 39

= 0 – 39

= - 39

39 x 25 + 78 x 16 + 39 + 39 x 42

= 39 x 25 + 2 x16  + 39 + 39 x 42

= 39 x (25 + 2 + 1 + 42)

= 39 x 70

= 2730