у=х^2+5/x^2-1 найти обл определения ? чётная или нечетная функция найти экстремумы

Какая окраска у венчика ржи дикой?

Пожалуйста помогите!(((УПОТРЕБИТЬ ГЛАГОЛЫ В ОДНОМ ИЗ ВРЕМЕН:Pr.Continuous,Pr.Simple,Past Simple или Future Simple,Past Continuous,Present Perfect. 1 Look!My friends(to play)football. 2 I(to invite)my friends to come to my place tomorrow. 3 Please give me a pencil,I (to lose) mine. 4 I (not to meet)Peter since Monday. 5 Nina just (to finish)work. 6 Where Sergei (to be)?-He(to go)home.He(to leave)the room a minute ago. 7 They (to read)"Ivanhoe" By Walter Scott a month ago.What about you?You(to read)"Ivanhoe"? 8 My watch (to stop).There (to be)something wrong with it. 9 You (to see) Jack today?-Yes,I (to see)him at the institute.We (to walk)down the street in the direction of,Mike's house,when we (to see)him in the window of a bus that (to pass)by.

(5a-10)^2-(3a-8)^2+132a при a= -1 

решите плиз