sat数学考试真题,SAT 数学题
1、SAT 数学题
A box contains wood beads,red glass beads,and blue glass beads. The number of glass beads is 4 times the number of wood beads. If one bead is to be chosen at random from box. the probability that a red glass bead will be chosen is 3 times the probablity that a blue glass bead will be chosen. If there are 12 red glass beads in the box, whta is the total number of beads in the box?
请写下过程,翻下题目的意思。。。谢谢
2、sat 数学题
1、if 18倍根号下18=r倍根号下t,where r and t are positive integers and r > t, which of following could be the value of rt? 答案为什么是108啊 完全没有思路啊
2、if the five cards 1 2 3 4 5 shown above are placed in a row so that number3 is never at either end, how many different arrangements are possible?答案是72 我混淆了 排列组合一直很差怎么办啊 到底怎么排列啊!
求详细解释。。满意答案会悬赏。。万分感谢!!
3、SAT数学题
4、SAT数学题
what is the angular measure of a sector of a circle of radius 6 if the area of the sector is 9*pi square units?
帮忙翻译一下.
9*pi square units?是什么啊?怎么换算?
谢谢~~~

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