Пошаговое объяснение:
17 3/15 - 8 7/20 +(9 11/15 -(2 1/15 - 1 37/90))- 1 17/60=
17 12/60 - 8 21/60 + (9 11/15 -(2 6/90 - 1 37/90)) -1 17/60=
16 72/60 - 8 21/60 + ( 9 11/15 - 3 43/90) -1 17/60-=
8 51/60 + (9 66/90 - 3 43/90)- 1 17/60=
8 51/60 + 6 23/90- 1 17/60=
8 153/180 + 6 46/90-1 51/180=
13 148/180=
13 74/90=
13 37/45
B²-81-b²+2b-1=2b-82
При b = 2
2*2-81=4-81=77
Ответ: 77
1)54:3=18(руб.)–стоимость бумаги.
2)54:18=3.
Ответ: кисточки дороже клея в 3 раза, так как стоимость бумаги такая же, как и стоимость клея
<span>Nick had to be at the airport at 6.30 in the morning. He ______ 1) (order) a taxi beforehand to pick him up at 5 o’clock. But the driver of the taxi ______ 2) (work) late the previous night and he _______ 3) (oversleep).Nick _____ 4) (wait) for three hours in vain. He _____ 5) (swear) quietly and went to switch the electric kettle. He ________ 6) (pour) water into the kettle when the eight o’clock pips ______ 7) (sound) on the radio. The announcer began to read the news. ”Reports _____8) (come) in of a crash near Heathrow Airport. A Boeing 707 _____ 9) (crash) shortly after taking off this morning. Flight number 8552….”.Nick turned pale.</span>