Re: [中學] 根號
※ 引述《Sandux (Royal1150)》之銘言：
: 1.根號29-a為有意義的數
: 則求a的區間。
29 - a > 0
=> a < 29
: 2.根號0.0016的根號=?
0.0016
= 0.0001 * 16
= (0.01)^2 * 4^2
= (0.04)^2
=> √0.0016 = 0.04
: 3.根號2x-5的平方+根號4x+20的平方=21 求x
[√(2x - 5)]^2 + [√(4x + 20)]^2 = 21
=> 2x - 5 + 4x + 20 = 21
=> 6x = 6
=> x = 1
: 参考來源：黃卷KB卷
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