а)есть 20 палочек(5квадратов по 4 палочки) минус 2 будет 18.Из этих палочек невозможно собрать 3 квадрата - возможно ошибка
б)20палочек минус 4 будет16. Один квадрат сложить с 8 палочек(по 2 на сторону тоесть 3 см) и 2 квадрата по 4 палоки.
Ответ: 36 (решение столбиком на фото)
15 - 4 3/20 =10 17/20
12 - 3 8/15=8 7/15
10 17/20-8 7/15=217/20-127/15=651/60-508/60=143/60=2 23/60
<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>
По частям надо интегрировать третий интеграл, причём два раза.