實數與虛數單位i, i x i = -1
例子1:
3i x i = 3 x (i x i) = 3 x (-1) = -3
例子2:
(2i + 5) + 6i = 5 + (2i + 6i) = 5 + 8i
例子3:
(2i + 5) – 6i = 5 + (2i – 6i) = 5 – 4i
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實數與虛數單位i, i x i = -1
例子1:
3i x i = 3 x (i x i) = 3 x (-1) = -3
例子2:
(2i + 5) + 6i = 5 + (2i + 6i) = 5 + 8i
例子3:
(2i + 5) – 6i = 5 + (2i – 6i) = 5 – 4i