Упростите выражение   (2корень из 5-1)(2корень из 5+1)

Помогите решить задачу:
Из 2 кг. ржаной муки получается 2,8 кг. хлеба. Сколько муки разходует хлебозавод на выпечку 20 тонн хлеба?
Заранее благодарю.

почему юридическая ответственность служит главным определителем, критерием правового поведения гражданина?

....Zn+.......-2Zno

Ca+.....-CaSO4+.....

закончить уравнения химических реакций

Какие времена нужно поставить? 1.The house (build) of wood with large verandas. 2. My husband went on business and I, our two (child) and Ah Sin, an old Chinese cook, stayed in the house. 3. The children (take) shower in the bathroom when the cook called me to see a hare, whose fur was burned from its back. 4. The cook took my fouryear-old son and we started (run) down the hill for a water-hole in the creek. 5. The water-hole in which we were hiding, was not very deep and the water (be) really hot. 6. I didn't remember how we got to the people, who gave us the (kind) care and attention.