решите уравнения:

6(х-1)+3(5-х)=9 ;

5(6+х)-5(2х+7)=0.

На изготовление одной детали робот тратит 2 мин 15 с . Сколько таких деталей он может изготовить за 9 суток непрерывной работы?

Present perfect: have/has + past parcticiple

Affirmative

I/You/ we/ thee've finished (have finished)

He/she/it's finished (has finished)

Negative

I/we/you/they______ finished (have not finished)

He/she/it________finished( has not finished)

Questions ers                                                Shorts answ

Have you practised a song?                            No, I/we haven't

Has he had a sleep?                                       Yes,_______has

Has she phoned home?                                   No,_______.

Have they been at the gig?                             Yes,______.