-4開方係咩 ?
回答 (5)
2007-03-11 8:50 pm
✔ 最佳答案
-4開方並沒有實數解。(No real solution)但如果考慮範圍包括虛數 (imaginary numbers, i.e. sqr(-1) = i),
那麼, sqt (-4) = sqr(4)*sqr(-1) = 2*i = 2i (i 代表開方-1)
這個課題屬於Complex Numbers (複數)，讀Pure Math會接觸到。
2007-03-18 9:18 pm
-4開方係
2i
2i
2007-03-11 9:35 pm
-4開方係-2
2007-03-11 8:49 pm
This is an imaginary number.
Let i = sqrt(-1)
-4 = 4(-1)
sqrt (-4) = sqrt (4) * sqrt (-1) = 2i
Standard way to answer it.
Let i = sqrt(-1)
-4 = 4(-1)
sqrt (-4) = sqrt (4) * sqrt (-1) = 2i
Standard way to answer it.
2007-03-11 8:46 pm
√(-4) = 2 i
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