計算題:
1(1).\(\displaystyle M_t=(400\ cos(\frac{\pi t}{250})+cos(\frac{\pi t}{25}),400\ sin(\frac{\pi t}{250})+sin(\frac{\pi t}{25}))\) (感謝Joy091,acc10033老師指正)
1(2). \(\displaystyle \frac{500}{9}\)
2(1). \(\displaystyle (1+cos\theta \ sin\theta)x^2+(1-cos\theta \ sin\theta)y^2-cos2\theta \ xy =3\)
2(2). \(\displaystyle A=\frac{1}{2} \ B=\frac{1}{6}\)
3(1) .\( (a+2)b\)
3(2) . \(\displaystyle \frac{-1+\sqrt{3}}{2}\)
4(1).可以理解成P點是在直線L上...嗎,如果是的話
直接架設數線就好,設P點坐標為x,其餘點分別為a,b,c,d
所求為|x-a|+|x-b|+|x-c|+|x-d|,最小值發生在\(x\in [b,c]\)