-25.72 +25.21-49.25
= 25 . (-72) + 25 . 21 - 49 . 25
= 25. ( -72 + 21 - 49 )
= 25 . ( -100)
= -2500
35. (14 - 23) - 23 .(14-35)
= 35 .14 - 35 . 23 - 23 . 14 + 23 . 35
= 35 .14 - (35 . 23 + 23 .14 - 23 . 35)
= 35 .14 - 23 . ( 35 + 14 - 35)
= 35 .14 - 23 .14
= 14 . (35 - 23)
= 14 .12
= 168