Suppose these two even numbers are n, n+2,? Then there's n? X (n +2) = 168, that is, n 2+2n = (n+1) 2-1=168, so there is (n+1) 2 =/kloc.

The trunk is 1, assuming that the branch is x and the small branch is x 2. According to the topic:1+x+x 2 = 91+0.

X 2+X-90 = 0, that is, (x-9)*(x+ 10)=0. Because the branches are not negative, the number of branches x=9, and each branch has 9 small branches according to the topic.