331. DS,一个圆在直接坐标系,圆心是(5,5),半径是5,问直线L是否和圆相交? 1)L在Y轴上的截距是-5 2)Y的斜率小于1 选C
332. 一个公司卖船,1999年卖出了船中,75%是sailboat,25%的船是motorboat,到了2000年,sailboat卖出的份额增长了10%,而motorboat卖出的份额增长了30%,问2000卖的所有船比1999年多多少 我选30% ; 我算出来15%哎
4. an isosceles right triangle, ask 直角边 (1) the primeter is x, and x^2-4x-4=0 (2) the hypotenuse is 2 Answer each is sufficient.
165.Xy>x^2y^2? (1)x^2=3/14 (2) y^2=1。 我选E
1. My first question: A does a job: 300ton/hour, B: 300ton/hour, C:200/2hours. How many hours will take the three working simultaneously to move 300ton sth.? Answer: 4/7 |