[微積] residue,級數收斂.發散
版友午安:
1.
Use complex integration method to find
∞ dx
∫ ─────
-∞ x^2-4ix
i i
2.Let a_n= ──── , b_n= ───── is the following series convergent or
2^(3n) 2^(3n+1)
divergent?
1 i 1 i 1
a_0 + b_0 +a_1 + b_1+.....= i+ ── + ── + ── + ── + ── +......
2 8 16 64 128
這兩題有點沒方向解題,
煩請版上高手給予指點
謝謝.
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