1) (125*5600-875*204) : 500 = 2) (250*840-145*1008) : 60=

1) Множители в скобках разложим с целью вынести общее за скобки:

(125 * 5600 - 875 * 204) : 500 = (5 * 25 * 5600 - 5 * 175 * 204) : 500 =

= (5 * 25 * 2 * 2800 - 5 * 5 * 35 * 2 * 102) : 500 =

= 25 * 2 * (5 * 2800 - 5 * 7 * 102) : 500 = 5 * (2800 - 7 * 102) * 50/500 =

= (2800 - 714) * 250/500 = 2 * (1400 - 357) * 250/500 =

= (1400 - 357) * 500/500 = 1043 * 1 = 1043.

2) Сделаем аналогично:

(250 * 840 - 145 * 1008) : 60 =

= (5 * 50 * 2 * 420 - 5 * 29 * 2 * 504) : 60 =

= (50 * 2 * 210 - 29 * 2 * 252) * 10/60 =

= (50 * 210 - 29 * 252) * 2 * 1/6 = 50 * 210/3 - 29 * 252/3 =

= 50 * 70 - 29 * 84 = 4 * (25 * 35 - 29 * 21) =

= 4 * 7 * (25 * 5 - 29 * 3) = 28 * (125 - 87) = 28 * 38 =

= (20 + 8) * 38 = 760 + 304 = 1064.