44,2b-(15,7b+23,45)при b=0,9и при b=17

Question

44,2b-(15,7b+23,45)при b=0,9и при b=17

Answer 1

44,2×0,9-(15,7×0,9+23,45)
39,78-(14,13+23,45)
39,78-37,75=2,03


44,2×17-(15,7×17+23,45)
751,4-(266,9+23,45)
751,4-290,35=461,05