Question

4<a<10 8<d<20а+в а-в а*в оценить 

Answer 1

4<a<10
8<d<20
-20<-d<-8
4+8=12<a+d<30=10+20
4-20=-16<a-d<2=10-8
4*8=32<ad<200=10*20

Answer 2

I'm sorry, but there seems to be some missing information in your question. The variables "a," "b," "c," and "d" are defined, but the values of "b" and "c" are not given. Without knowing the values of "b" and "c," I cannot accurately evaluate the expression "a+b-a*b."

Please provide more information so I can assist you better.