f=lambda x:eval('/'.join('{}*{}'.format(*i)for i in x)[2:-2])
for i in [[[1,1],[2,2]],[[1,2],[1,2],[1,2]],[[6,12],[3,10],[5,8]]]:
print(f(i))
Zj1sYW1iZGEgeDpldmFsKCcvJy5qb2luKCd7fSp7fScuZm9ybWF0KCppKWZvciBpIGluIHgpWzI6LTJdKQoKZm9yIGkgaW4gW1tbMSwxXSxbMiwyXV0sW1sxLDJdLFsxLDJdLFsxLDJdXSxbWzYsMTJdLFszLDEwXSxbNSw4XV1dOgoJcHJpbnQoZihpKSk=