729,81

729,81

729,81

792,81

=[792,81x(0,25 +0,75 )]+(99-90-9)

=[792,81x1]+0=792,81+0=792,81

( 792,81 x 0,25 + 792,81 x 0,75 ) x ( 11 x 9 - 900 x 0,1 - 9 )

= 792,81 x 0

= 0 

\(\left(792,81\times0,25+792,81\times0,75\right)\times\left(11\times9-900\times0,1-9\right)\)

\(=\left(792,81\times\left(0,25+0,75\right)\right)\times\left(11\times9-10\times9-9\right)\)

\(=(792,81\times1)\times\left(9\times\left(11-10-9\right)\right)\)

\(=792,81\times9\times\left(-8\right)\)

\(=-57082,32\)

792,81 x 0,25 + 792,81 x 0,75) x (11 x 9 - 900 x 0,1 - 9)

= (792,81 x 0,25 + 792,81 x 0,75) x 9 x (11 - 100 x 0,1 - 1)

= (792,81 x 0,25 + 792,81 x 0,75) x 9 x (11 - 10 - 1)

= 792,81 x 0,25 + 792,81 x 0,75) x 9 x 0

= 0

mik nghĩ là vậy bn nhé 

(792,81×0,25+792,81×0,75)×(11×9-900×0,1-9)

=(792,81×0,25+792,81×0,75) * 0

=0

Tính nhanh:

a) 0,125 + 21,075 + 88,36 + 9,875 + 78,925 + 11,64

= \((0,125+9,875)+(21,075+78,925)+(88,36+11,64)\)

= \(10+100+100\)

= \(210\)

b) 3457 - 27 . 48 - 48 . 73 + 6543

= \((3457 +6543) - (27 . 48 + 48 . 73)\)

\(= 10000 - 48 . (27 + 73) \)

\(= 10000-48.100\)

\(= 10000 - 4800\)

\(= 5200\)

c) (792,81. 0,25 + 792,81 0,75). (11. 9 – 900 . 0,1 - 9)

= [ 792,81 . ( 0,25 + 0,75 ) ] . ( 99 - 90 - 9 )

= [ 792,81 . 1 ] . ( 9 - 9)

= 792,81 . 0

= 0

\(\left(792,81\times0,25+792,81\times0,75\right)\times\left(11\times9-900\times0,1-9\right)\)

\(=\left[792,81\times\left(0,25+0,75\right)\right]\times\left(1089-90-9\right)\)

\(=\left(792,81\times1\right)\times990\)

\(=792,81\times990\)

\(=784881,9\)

ta có :

(792,81 x 0,25 + 792,81 x 0,75 ) x ( 11 x 9 - 900 x 0,1 - 9 )

=> [ 792,81 . ( 0,25 + 0,75 ) ] x ( 99 - 90 - 9 )

=> [ 792,81 . 1 ] x ( 9 - 9)

=> 792,81 x 0

= 0

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