25x143+25x57-105
= 25 x (143 + 57) - 105
= 25 x 200 - 105
= 5000 - 105
= 4895
 
25x135+25x65-250
= 25 x ( 135 + 65) - 250
= 25 x 200 - 250
= 5000 - 250
= 4750


33x55+33x66-33x21
= 33 x (55+66-21)
= 33 x 100
= 
 

25x143+25x57-105.       
= ( 25 x 143 ) + ( 25 x 57 ) -105
= 3575 + 1425 - 105
= 5000 - 105
= 4895
25x135+25x65-250
= ( 25 x 135 ) + ( 25 x 65 ) - 250
= 3375 + 1625 - 250
= 5000 = 250
= 4750 

25 x 143 + 25 x 57 - 105
= 25 x ( 143 + 57 )
= 25 x 200 - 105
= 5000 - 105
= 4895
25 x 135 + 25 x 65 - 250
= 25 x ( 135 + 65 ) - 250
= 25 x 200 - 250
= 5000 - 250 
= 4750
33 x 55 + 33 x 66 - 33 x 21
= 33 x ( 55 + 33 - 21 )
= 33 x 67
= 2211

25x143+25x57-105=3575+1425-105=5000-105=4895
25x135+25x65-250=3375+1625-250=4000-250=3750
33x55+33x66-33x21=33x (55+66-21) = 33x 100=3300

25 * 143 + 25* 57-105
=25*(143+57)-105
=25*(200-105)
= 25*5
=75