Какова должна быть площадь лыж, чтобы человек массой 70 кг оказывал на снег давление не больше 0,5 Н/см.кв.?

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This story is (set) in Wales in the Middle Ages. There was a prince whose name (be) Llewellyn. He (live) in the valley. He(have) a baby son. He also (have) a dog called Gelert. One day the prince (go) hunting. He (leave) the dog(look) after the baby . Some wolves (come) out of a wood. They (run) to the cottage. THe dog (see) the wolves and (hide) the baby. Then he(run) outside and (fight) the wolves. He (kill) two but was wounded. He was tired and (lie) down to sleep. The prince (return). He(see) the all in blood. He (notice) that his son's bed was empty. He (take) his sword and (kill) the dog while it(sleep). Then he (hear) the baby (cry) and(find) him. Through the window he(see) the two dead wolves. Then he (understand). He(carry) the dog to the top of a hill and buried it. He (collect) a lot of stones to mark the grave. You can still (see) it tooday at Bedgelert.

Caco3+...=Ca(no3)2 что надо добавь что бы произошла реакция

число различных корней уравнения f(4x^2 +4x+2)=0 равно

(дробь) 

7 (делить на)

3 в степени log по основанию 3 числа 8