Question

Tính bằng cách hợp lí:

a) 512. (2 - 128) - 128.(-512)

b) 2155 - (174 + 2155) + (-68 + 174)

Answer 1

a) \(512.\left(2-128\right)-128.\left(-512\right)\)

\(=512.\left(-126\right)-128.\left(-512\right)\)

\(=\left(-512\right).126-128.\left(-512\right)\)

\(=\left(-512\right)\left(126-128\right)\)

\(=\left(-512\right).\left(-2\right)\)

\(=1024\)

b) \(2155-\left(174+2155\right)+\left(-68+174\right)\)

\(=2155-174-2155-68+174\)

\(=2155-2155-174+174-68\)

\(=-68\)

NĂM MỚI AN LÀNH

Answer 2

Ta có : 

\(a)\)\(512.\left(2-128\right)-128.\left(-512\right)\)

\(=\)\(512\left(2-128+128\right)\)

\(=\)\(512.2\)

\(=\)\(1024\)

Answer 3

a)    \(512.\left(2-128\right)-128.\left(-512\right)\)

\(=512.2-512.128+128.512\)

\(=1024\)

b)    \(2155-\left(174+2155\right)+\left(-68+174\right)\)

\(=2155-174-2155-68+174\)

\(=-68\)

Answer 4

a ) 512 . ( 2 - 128 ) -128 . ( -512 ) 

=  512  . 2  - 512 . 128  + 128 . 512 

=  512 . 2  + 0 

=        1024 

Answer 5

a ) 512 . ( 2 - 128 ) - 128 . ( - 512 )

= 512 . 2 - 512 . 128 + 128 . ( - 512 )

= 1024 - 0

= 1024

Answer 6

512.[2-128]-128.[-512]

128.4.2-128.4.128-128.[-512]

128.8-512.128-128.[-512]

128.[8-512-[-512]]

128.8

1024

Answer 7

a)512.(2-128)-128.(-512)

=512.(-126)-128.(-512)

=(-512).126-128.(-512)

=(-512).(126-128)

=(-512).(-2)

=1024

b)2155-(174+2155)+(-68+174)

=2155-174-2155-68+174

=2155-2155-174+174-68

=-68

Answer 8

512. (2 - 128) - 128.(-512)

 =128.8-128.512-128.[-512]

=128.[8-512-[-512]]

=128.8

=1024