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The video constructs a recursion tree by setting the target computation $f(7)$ as the root node. It then recursively applies the formula $f(n) = f(n-1) + f(n-2)$ to split each non-base-case node into two child nodes.

Conditions: The recurrence relation is $f(n) = f(n-1) + f(n-2)$.; The base cases are $f(1) = 1$ and $f(2) = 1$.; The target computation is $f(7)$.

The video constructs a recursion tree by setting the target computation $f(7)$ as the root node. It then recursively applies the formula $f(n) = f(n-1) + f(n-2)$ to split each non-base-case node into two child nodes.

Conditions: The recurrence relation is $f(n) = f(n-1) + f(n-2)$.; The base cases are $f(1) = 1$ and $f(2) = 1$.; The target computation is $f(7)$.