1、SAT2数学题

The area of the region enclosed by the graph of the polar curve r=1/(sinx+cosx)and the x- and y-axes is( )

2、几道SAT2数学题，数学高手进！！！急急急急急急！！！！重赏！！！！！

这是巴郎上的几道题，求人讲讲！！

1. Observers in two locations sight a rocket at a height of 12km.The angles of elevation from these locations are 80.5°and 68.0°.What is the distance between the two points?

A0.85 B4.27 C5.71 D20.92 E84.50（单位都是km)

2. Which of the following are the coordinates of a focus of 5x²+4x²-20x+8y+4=0?（平方）

A(1,-1) B(2,-1) C(3,-1) D(2,-2) E(-2,1)

3.Which of the following is an asymptote of y=(x²+3x+2)/(2+x)?

Ax=-2 Bx=-1 Cx=0.5 Dx=1 Ex=2

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3、一道SAT2数学题

答好了我加分 if f(x)=x³-4x²-3x+2 which of the following are true?

1. the function f is increasing for x≥3

2.the equation f(x)=o has two nonreal solutions

3.f(x)≥-16 for all x≥0

答案是1和3，求解。为什么2不对？1,3又是怎么算出来的？

4、SAT2数学题，重金悬赏！！！有关复数

1.If i(复数里的那个i)is a root of x^4+2x^3-3x^2+2x-4=0,the product of the real roots is

A.-4 B.-2 C.0 D.2 E.4

2.The nature of the roots of the equation 3x^4+4x^3+x-1=0is

A.3 positive real roots and 1 negative real root

B.3 negative real roots and 1 positive real root

C.1 negative real root and 3 complex roots

D.1 positive real root,1 negative real root,and 2 complex roots

E.2 positive real roots,1 negative real root,and 1 complex root

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