Упростите выражение -1 2/5а•(+1 3/4)•(-1 1/4)•(-2 2/7b)

Question

Упростите выражение -1 2/5а•(+1 3/4)•(-1 1/4)•(-2 2/7b)

Answer 1

-1 2/5а×(+1 3/4)×(-1 1/4)×(-2 2/7в)=-7/5а×7/4×(-5/4)×(-16/7в)=

=-1а×7×(-1)×(-1в)=-7а×(-1)×(-в)=7а×(-в)=-7ав