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【Sin20°的根式表达是这样的?】
上面的手工算K值MN分子分母颠倒了,下面才正确:
输入1: a=8, b=, c=-6, d=√3; 输出结果1: x1=-0.9848077530, x2=0.3420201433, x3=0.6427876097 m=-23.3826859022 n=13.5000000000
k=1/81,
a=2-1=1,
b=1-2/9=7/9,
c=-k, 输入3: a=1, b=1, c=7/9, d=-1/81; 输出结果3: x1=0.0155570059, x2=-0.5077785029+0.7319411151i, x3=-0.5077785029-0.7319411151i m=21.3333333333 n=24.6336114854
t=x2的实部+虚部=-0.5077785029+0.7319411151=0.2241626122,
a1=√(-23.3826859022/(8*(9t+1)))=√(-23.3826859022/24.1397080784)=-0.98943543685536832396698299993792,
sin260°=-0.98480775301220805936674302458952,
是近似值?
可以手工得到根式结果,很复杂,能用传统尺规法做出根式比吗?开玩笑呢!
里面有开立方的根式,很难或无法做! |
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