Question

53 .39 + 47 . 39 - 53 . 21 - 47 .21 tính nhanh

 

Answer 1

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

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

= 100 . 39 - 100 . 21

= 100 . (39 - 21)

= 100 . 18

= 1800

Answer 2

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

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

=39 . 100 - 21 . 6

= 3900 -126

=3774

Answer 3

\(53.39+47.39-53.21-47.21\)

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

\(=39.100-6.21\)

\(=3.13.100-2.3.21\)

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

\(=3.1258\)

\(=3774\)

Answer 4

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

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

= 1000 x 39 - 6 x 21

= 39000 - 126

= 38874

Answer 5

53 x 49 + 47 x 39 - 53 x 21 - 47 x 21

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

= 100 x 39 - 100 x 21

= 100 x ( 39 - 21)

= 100 x 18

= 1800

Answer 6

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

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

= 100 . 39 - 100 . 21

= 100 . (39 - 21)

= 100 . 18

= 1800

Answer 7

53 x 49 + 47 x 39 - 53 x 21 - 47 x 21

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

= 100 x 39 - 100 x 21

= 100 x ( 39 - 21)

= 100 x 18

= 1800

Answer 8

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

= ( 39 - 21 ) x 100

= 18 x 100

= 1800

Answer 9

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

                                                       = 80 , 60 - 39 , 53 

                                                       = 40 , 47