SAT 思路是什么If X and Y are tw
编辑: admin 2017-01-03
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4
35XY=5*7*XY
所以XY必须为5*7*n^2的形式
140=5*7*4符合条件
所以答案选D
类似问题
类似问题1:SAT数学思路f(x)=kg(x)+2The function above is defined in terms of another function g for all values of X, where K is a constant.If t is a number for which f(t)=30,and g(t)=8, what does k equal?[英语科目]
Suppose X=t,
then f(x)=kg(x)+2 --> f(t)=kg(t)+2 --> 30=k*8+2 -->k=7/2
类似问题2:这题看不懂,P is the set of positive factors of 20 and Q is the set of positive factors of 12.If x is a member of set P and y is the member of set Q,what is the greatest possible vaule of x-y?答案是19.[数学科目]
factor就是系数,如6的factor是1,2,3,6.
题目:P组包括了20的所有大于0的系数,Q组包括了12所有大于0的系数.x是P之一,y是Q之一,x-y最大可以是多少
白话=20最大的系数减去12最小的系数
20最大的factor是20 (20*1=20),12最小系数是1(12*1=12),20-1=19
类似问题3:一道SAT数学,06年的真题.What is the greatest possible area of a triangle with one side of length 7 and another side of length 10?A.17B.34C.35D.70E.140正确答案是C.我选对了,但不知道为什么.只是把这个三角形意淫成直角[英语科目]
C
一般的三角形面积公式是 a*b*sinc (两邻边一夹角)
当这个三角形是直角三角形时 sinc最大,为1,所以面积最大是7*10/2,当他是直角三角形时.
类似问题4:1. Which of the following is an element of both the set of positive odd integers and the set of prime numbers?A. 2B. 5C. 9D. 12E. 21 2. For 12 bottles of shampoo of various brands , the cost an volume of each are displayed in the scatterplot above,[英语科目]
1.positive odd integers 表示奇整数,prime numbers表示质数.五个选项里面只有5是质数
2.第二个题我没算.但是大概的做法应该是先确定12个点的cost和volume(用尺子比着图片找坐标),然后求均值.然后看12个里面哪个与均值最接近
(我在电脑上不好描点)
类似问题5:SAT数学题,求解答步骤以及解这种题的思路, [数学科目]
56+42-(78-7)=27