456 x 65 + 456 x 25 + 456 x 10

=456x(65+25+10)

=456x100

=45 600

kq 7754

456*4+456*3+4562

=456*(4+3)+4562

=456*7+4562

=3192+4562

=7754

`a)25xx532xx4`

`=(25xx4)xx432`

`=432xx100=43200`

`b)456xx200-456xx100`

`=456xx(200-100)`

`=456xx100=45600`

\(a,25\times432\times4=25\times4\times432=100\times432=4320\\ b,456\times200-456\times100=456\times\left(200-100\right)=456\times100=45600\)

456x45+456x10-456x50

=456x(45+10-50)

=456x5

=2280

\(456.45+456.10-456.50\)

\(=456\left(45+10-50\right)\)

\(=456.5=2280\)

P/s : Dấu chấm là dấu nhân nha.

715 + 456 + 544 + 285

= (715 + 285) + (456 + 544)

= 1000 + 1000

= 2000

544 + 135 + 157 + 843 + 865 + 456 =   ( 544 + 456 ) + ( 135 + 865 ) + ( 157 + 834 ) =   1000 + 1000 + 1000   =   3000

Bạn xem lại đề đi, số kia là 456 hay 458 nhé.

a,456*65+456*34+456

=456*65+456*34+456*1

=456*(65+34+1)

=456*100

=45600

a) = 456 x ( 65 + 34 + 1 )

     = 456 x 100

     = 45600

124x456x(810-405x2):1997

=124x456x(810-810):1997

=123x456x0:1997

=0

\(124.456.\left(810-405.2\right):1997=124.456.\left(810-810\right):1997=124.456.0:1997=0\) \(0\)

 hoang van binh       !hc tốt bn nhé ^_~!