Math:
1. line L and K intersect in point (3,-2), gives the slope of L, ask what is the slope of K.
answer: Unknow.
2. x^4-y^4 is odd interge, whether the following is odd interge:
x^2+y^2 x^2-y^2 x+y x-y
answer: all
3. the line l go throuth origin and (-2,3), line K 垂直 line l, ask the slope of line k
answer:
4.two line, l and k, 4 point in l and 5 poing in K, ask could make how much trangle.
answer: c(9,3)-c(4,3)-c(5,3)
5.give one interge, around 7000, 问100以内prime factor.(对不起,想不起来具体的数字了)
answer: first root the interge, then 试算.