a)483*8+483+483
=483*8+483*1+483*1
=483*(8+1+1)
=483*10
=4830
b)620*43+620*56+620
=620*43+620*56+620*1
=620*(43+56+1)
=620*100
=62000
a) 483 x 8 + 483 + 483
= 483 x 8 + 483 x 1 + 483 x 1
= 483 x ( 8 + 1 + 1 )
= 483 x 10
= 4830
b) 620 x 43 + 620 x 56 + 620
= 620 x 43 + 620 x 56 + 620 x 1
= 620 x ( 43 + 56 + 1 )
= 620 x 100
= 62000
_HT_