Question

tinh  nhanh 

237 . (-26) + 26 .137

63. ( -25 ) + 25 . ( - 23 )

Answer 1

237.(-26)+26.137= (-237+137).26= -100.26= -2600

Answer 2

237.(-26) + 26.137 = 26.137 - 26.237 = (137 - 237).26 = -100.26 = -2600

63.(-25) + 25.(-23) = -23.25 - 63.25 = (-23 - 63).25 = -89.25 = -2225